www.dell.com | support.dell.comDell™ PowerEdge™ T300 SystemsHardware Owner’s Manualbook.book Page 1 Sunday, June 21, 2009 10:04 AM

10 Contentsbook.book Page 10 Sunday, June 21, 2009 10:04 AM

100 Installing System Components2Remove the system cover (see "Removing the System Cover" on page 66).3Disconnect the cable between the RAID

Installing System Components 101Figure 3-21. Installing and Removing a RAID Battery1 RAID battery 2 battery carrier release tab3 battery carrier 4 bat

102 Installing System ComponentsInstalling a RAID Battery1Insert the RAID battery into the battery carrier (see Figure 3-21).2Insert the battery carri

Installing System Components 103 NOTE: If you are removing the card permanently, disconnect and remove the ribbon cable from the system board.Figure

104 Installing System Components NOTE: If you are removing the card permanently, install a filler bracket in the empty card slot. NOTE: Filler bracke

Installing System Components 1057Insert the RAC card into expansion card slot 1 on the system board (see Figure 6-1) and press down firmly (see Figure

106 Installing System Components1Turn off the system and attached peripherals, and disconnect the system from the electrical outlet and from the perip

Installing System Components 107Cooling FansThe system contains two cooling fans, an expansion card fan for the expansion cards, and a system fan for

108 Installing System ComponentsFigure 3-24. Removing and Installing the Expansion Card FanInstalling the Expansion Card Fan1Hold the fan with the fan

Installing System Components 1093Route the fan power cable through the adjacent slot in the chassis, and connect the cable to the FAN1 connector on th

About Your System 11About Your SystemThis section describes the physical, firmware, and software interface features that provide and ensure the essent

110 Installing System ComponentsFigure 3-25. Removing and Installing the System FanInstalling the System Fan1Hold the replacement fan with the fan cab

Installing System Components 1114Replace the processor airflow shroud (see "Installing the Processor Airflow Shroud" on page 72).5Replace th

112 Installing System Components• Install memory modules in bank 1 (DIMM1_x) before installing memory modules in bank 2 (DIMM2_x), and install memory

Installing System Components 113 CAUTION: Memory Module DIMMs are hot to the touch for some time after the system has been powered down. Allow the DI

114 Installing System Componentssupport team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. Read and follow

Installing System Components 11511Enter the System Setup program, and verify that the value for System Memory reflects the newly installed memory (see

116 Installing System Components NOTICE: Never remove the heat sink from a processor unless you intend to remove the processor. The heat sink is nece

Installing System Components 1178Position your thumb firmly over the socket release lever and release the lever from the locked position. Rotate the l

118 Installing System ComponentsInstalling the Processor1Unpack the new processor.2 Ensure that the release lever on the processor socket is fully ext

Installing System Components 119b Place the heat sink on the processor (see Figure 3-27).c Lower the heat-sink retainers over the edges of the heatsin

12 About Your System• Documentation for any components you purchased separately provides information to configure and install these options.• Updates

120 Installing System Components CAUTION: There is a danger of a new battery exploding if it is incorrectly installed. Replace the battery only with

Installing System Components 121Installing the System Battery NOTICE: To avoid damage to the battery connector, you must firmly support the connector

122 Installing System Componentssupport team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. Read and follow

Installing System Components 123Installing the Chassis Intrusion Switch1Align the chassis intrusion switch with the securing bracket notch (see Figure

124 Installing System ComponentsFigure 3-31. Removing and Installing the Power Supply Distribution ModuleInstalling the Power Supply Distribution Modu

Installing System Components 1254Replace the processor airflow shroud (see "Installing the Processor Airflow Shroud" on page 72).5Replace th

126 Installing System ComponentsbWhile pulling the release pin, slide the backplane towards the top of the system.cPull the backplane board until the

Installing System Components 127Installing the SAS Backplane1Position the SAS backplane so that the securing tabs on the chassis are fully inserted in

128 Installing System Components4Disconnect the control panel cable at back of the control panel (see Figure 3-33).aSqueeze the metal tabs on the ends

Installing System Components 129Installing the Control Panel1Insert the control panel into the system as shown in Figure 3-33.2Install the two screws

About Your System 13Front-Panel Features and IndicatorsFigure 1-1 shows the controls, indicators, and connectors located on the system's front pa

130 Installing System Components6Remove the RAC card, if applicable (see "Removing the RAC Card" on page 102).7Remove the SAS controller car

Installing System Components 131Figure 3-34. Removing and Installing the System BoardInstalling the System Board1Align the back connectors on the syst

132 Installing System Components5Replace the memory modules in the same sockets from which they were removed (see "Installing Memory Modules"

Troubleshooting Your System 133Troubleshooting Your SystemSafety First—For You and Your SystemTo perform certain procedures in this document, you must

134 Troubleshooting Your SystemChecking the EquipmentThis section provides troubleshooting procedures for external devices attached to the system, suc

Troubleshooting Your System 135Action1Check the system and power connections to the monitor.2Determine whether the system has an expansion card with a

136 Troubleshooting Your System3Swap the faulty keyboard or mouse with a working keyboard or mouse.If the problem is resolved, replace the faulty keyb

Troubleshooting Your System 137eReconnect the system and peripherals to power and restart. If the mouse and keyboard are operational, proceed to the n

138 Troubleshooting Your SystemTroubleshooting a Serial I/O DeviceProblem• Device connected to the serial port is not operating properly.Action1Turn o

Troubleshooting Your System 139cTurn off the USB device and swap the interface cable with a working cable. Turn on the device.If the problem is resolv

14 About Your SystemTable 1-2. Front-Panel ComponentsItem Component Icon Description1 3.5-inch drive bay Holds an optional diskette drive. 2 lower 5.2

140 Troubleshooting Your SystemfRepeat step a and step b. gSet the NVRAM_CLR jumper to the disabled position.hClose the system.iReconnect the system a

Troubleshooting Your System 1415Ensure that the NICs, hubs, and switches on the network are all set to the same data transmission speed. See the netwo

142 Troubleshooting Your System8Run the appropriate online diagnostic test (see "Using Dell PowerEdge Diagnostics" on page 163).If the tests

Troubleshooting Your System 143Troubleshooting the System Battery Problem• System message indicates a problem with the battery.• System Setup program

144 Troubleshooting Your SystemAction CAUTION: Many repairs may only be done by a certified service technician. You should only perform troubleshootin

Troubleshooting Your System 145Troubleshooting System Cooling ProblemsProblem• Systems management software issues a fan-related error message.ActionEn

146 Troubleshooting Your System5Ensure that the faulty fan's power cable is firmly attached to the fan power connector (see "Cooling Fans&qu

Troubleshooting Your System 147If an error messages appears indicating a fault with a specific memory module, go to step 12.If any other system messag

148 Troubleshooting Your System15Close the system (see "Installing the System Cover" on page 67).16Reconnect the system to its electrical ou

Troubleshooting Your System 1498Reconnect the system to the electrical outlet, and turn on the system and attached peripherals.If the problem is not r

About Your System 157 LCD panel Provides system ID, status information, and system error messages. The LCD lights blue during normal system operation.

150 Troubleshooting Your System6Ensure that the diskette drive interface cable is securely connected to the diskette drive and the system board.7Ensur

Troubleshooting Your System 15121Remove the processor airflow shroud (see "Removing the Processor Airflow Shroud" on page 70).22Open the sys

152 Troubleshooting Your System3Run the appropriate online diagnostic test (see "Using Dell PowerEdge Diagnostics" on page 163).4Turn off th

Troubleshooting Your System 153See the documentation for the tape drive for instructions on selecting the SCSI ID number and enabling or disabling ter

154 Troubleshooting Your System• One or more hard drives not recognized by the system.Action CAUTION: Many repairs may only be done by a certified ser

Troubleshooting Your System 155cRemove the processor airflow shroud (see "Removing the Processor Airflow Shroud" on page 70).dVerify that th

156 Troubleshooting Your System2Remove the front bezel (see "Removing the Front Bezel" on page 63).3If you are experiencing problems with mu

Troubleshooting Your System 157cRemove the processor airflow shroud (see "Removing the Processor Airflow Shroud" on page 70).dVerify that th

158 Troubleshooting Your System2Enter the System Setup program and ensure that the SAS or SAS RAID controller is enabled (see "Entering the Syste

Troubleshooting Your System 15912Replace the processor airflow shroud (see "Installing the Processor Airflow Shroud" on page 72).13Close the

16 About Your SystemBack-Panel Features and IndicatorsFigure 1-2 shows the controls, indicators, and connectors located on the system's back pane

160 Troubleshooting Your System6Replace the processor airflow shroud (see "Installing the Processor Airflow Shroud" on page 72).7Close the s

Troubleshooting Your System 161fClose the system (see "Installing the System Cover" on page 67).gReconnect the system to the electrical outl

162 Troubleshooting Your System7Close the system (see "Installing the System Cover" on page 67).8Reconnect the system to the electrical outl

Running the System Diagnostics 163Running the System DiagnosticsIf you experience a problem with your system, run the diagnostics before calling for t

164 Running the System Diagnostics• View status messages that inform you if tests are completed successfully.• View error messages that inform you of

Running the System Diagnostics 165System Diagnostics Testing OptionsClick the testing option in the Main Menu window. Table 5-1 provides a brief expla

166 Running the System DiagnosticsSelecting Diagnostics OptionsUse the Diagnostics Options area to select how you want to test a device. You can set t

Jumpers and Connectors 167Jumpers and ConnectorsThis section provides specific information about the system jumpers and describes the connectors on th

168 Jumpers and ConnectorsFigure 6-1. System Board ConnectorsTable 6-1. System Board ConnectorsItem Connector Description1 PCIX_5 PCI-X connector (slo

Jumpers and Connectors 1696 J3 USB connectors (USB1, USB2, USB3, and USB4)7 J4 NIC connectors (LOM1_UP and LOM2_ DOWN)8 VGA Video connector9 COM Seria

About Your System 17• Always attach an external device while your system and the device are turned off. Next, turn on any external devices before turn

170 Jumpers and ConnectorsJumper Settings31 SATA_E SATA drive connector32 SATA_C SATA drive connector33 SATA_A SATA drive connector34 HDD_LED SAS hard

Jumpers and Connectors 171SAS Backplane Board Connectors CAUTION: Many repairs may only be done by a certified service technician. You should only pe

172 Jumpers and ConnectorsFigure 6-2. SAS Backplane Connectors1 release pin 2 SAS/SATA connector3 backplane connector 4 power connector5 SAS/SATA driv

Jumpers and Connectors 173Disabling a Forgotten PasswordThe password jumper on the system board enables the system password features or disables them

174 Jumpers and Connectorsbook.book Page 174 Sunday, June 21, 2009 10:04 AM

Getting Help 175Getting HelpContacting DellFor customers in the United States, call 800-WWW-DELL (800-999-3355). NOTE: If you do not have an active

176 Getting Helpbook.book Page 176 Sunday, June 21, 2009 10:04 AM

Glossary 177GlossaryThis section defines or identifies technical terms, abbreviations, and acronyms used in your system documents.A — Ampere(s).AC — A

178 Glossaryboot routine — A program that clears all memory, initializes devices, and loads the operating system when you start your system. Unless th

Glossary 179DDR — Double-data rate. A technology in memory modules that potentially doubles the output.device driver — A program that allows the opera

18 About Your SystemFigure 1-3. Redundant Power Supply IndicatorsNIC Indicator CodesEach NIC on the back panel has an indicator that provides informat

180 Glossaryexpansion bus — Your system contains an expansion bus that allows the processor to communicate with controllers for peripherals, such as N

Glossary 181headless system — A system or device that functions without having a keyboard, mouse, or monitor attached. Normally, headless systems are

182 GlossarykHz — Kilohertz.KMM — Keyboard/monitor/mouse.KVM — Keyboard/video/mouse. KVM refers to a switch that allows selection of the system from w

Glossary 183memory — An area in your system that stores basic system data. A system can contain several different forms of memory, such as integrated

184 Glossarypixel — A single point on a video display. Pixels are arranged in rows and columns to create an image. A video resolution, such as 640 x 4

Glossary 185rpm — Revolutions per minute.RTC — Real-time clock.SAS — Serial-attached SCSI.SATA — Serial Advanced Technology Attachment. A standard int

186 Glossarysystem diskette — See bootable diskette.system memory — See RAM.System Setup program — A BIOS-based program that allows you to configure y

Glossary 187video adapter — The logical circuitry that provides (in combination with the monitor) your system’s video capabilities. A video adapter ma

188 Glossarybook.book Page 188 Sunday, June 21, 2009 10:04 AM

Index 189IndexNumerics5.25-inch driveinstalling, 91removing, 88Aalert messages, 40Bbaseboard management controllerSee BMC.battery (RAID)installing, 99

About Your System 19LCD Status MessagesThe system's control panel LCD provides status messages to signify when the system is operating correctly

190 IndexDdamaged systemstroubleshooting, 142Dellcontacting, 175diagnosticsadvanced testing options, 165testing options, 165when to use, 164diagnostic

Index 191control panel assembly, 129diskette drive, 86expansion card fan, 108expansion cards, 95hard drive, 84hard drive (cabled), 82hard drive (hot-p

192 Indexsetup, 56system, 53POSTaccessing system features, 12power indicators, 17power suppliesindicators, 17installing, 77removing, 73, 75troubleshoo

Index 193serial port connector, 16setup password, 56startupaccessing system features, 12supportcontacting Dell, 175systemclosing, 67opening, 66system

194 Indexinternal connector for memory key, 105USB deviceconnectors (back panel), 16connectors (front panel), 13troubleshooting, 138USB memory keytrou

Notes, Notices, and Cautions NOTE: A NOTE indicates important information that helps you make better use of your computer. NOTICE: A NOTICE indicates

20 About Your SystemTable 1-5. LCD Status MessagesCode Text Causes Corrective ActionsN/A SYSTEM NAMEA 62-character string that can be defined by the u

About Your System 21E1226 PCI Rsr 1.5V PwrGd1.5V Riser Card Power Good failure.See "Getting Help" on page 175.E1229 CPU # VCORE Processor #

22 About Your SystemE1414 CPU # ThermtripSpecified microprocessor is out of acceptable temperature range and has halted operation. See "Troublesh

About Your System 23E141F CPU Protocol The system BIOS has reported a processor protocol error.See "Getting Help" on page 175.E1420 CPU Bus

24 About Your SystemE1624 PS Redundancy The power supply subsystem is no longer redundant. If the last supply fails, the system will go down.See "

About Your System 25E171F PCIE Fatal Err B## D## F##The system BIOS has reported a PCIe fatal error on a component that resides in PCIe configuration

26 About Your SystemE1A18 PDB Ctrl CableControl cable for the power distribution board (PDB) is missing or badReseat the cable. If the problem persist

About Your System 27E201C SMI Init System management interrupt (SMI) initialization failure.See "Getting Help" on page 175.E201D Shutdown Te

28 About Your SystemE2111 SBE Log Disable DIMM #The system BIOS has disabled memory single-bit error (SBE) logging, and will not resume logging furthe

About Your System 29Solving Problems Described by LCD Status MessagesThe code and text on the LCD can often specify a very precise fault condition tha

Contents 3Contents1 About Your System. . . . . . . . . . . . . . . . . . 11Other Information You May Need . . . . . . . . . . . . 11Accessing Syste

30 About Your SystemAny of these actions will remove fault messages, and return the status indicators and LCD colors to the normal state. Messages wil

About Your System 31Table 1-6. System MessagesMessage Causes Corrective ActionsAlert! DIMM1_A and DIMM1_B must be populated with a matched set of DIMM

32 About Your SystemDiskette drive 0 seek failure.Faulty or improperly inserted diskette, incorrect configuration settings in the System Setup program

About Your System 33Fatal Error caused a system reset:Please check the system event log for detailsA fatal system error occurred and caused the system

34 About Your SystemMemory address line failure at address, read value expecting valueMemory double word logic failure at address, read value expectin

About Your System 35No boot sector on hard driveIncorrect configuration settings in System Setup program, or no operating system on hard drive.Check t

36 About Your SystemPlug & Play Configuration ErrorError encountered in initializing PCIe device; faulty system board.Install the NVRAM_CLR jumper

About Your System 37Shutdown failure Shutdown test failure. See "Troubleshooting System Memory" on page 146.The amount of system memory has

38 About Your SystemTPM operation is pending. Press I to Ignore or M to Modify to allow this change and reset the system. WARNING: Modifying could pre

About Your System 39Warning! Detected missing RAID hardware for the embedded RAID subsystem.RAID key or RAID DIMM missing when system is in RAID mode.

4 ContentsUsing the System Setup Program. . . . . . . . . . 42System Setup Options . . . . . . . . . . . . . . . . . . 43Main Screen . . . . . . .

40 About Your SystemWarning MessagesA warning message alerts you to a possible problem and prompts you to respond before the system continues a task.

Using the System Setup Program 41Using the System Setup ProgramAfter you set up your system, run the System Setup program to familiarize yourself with

42 Using the System Setup ProgramUsing the System Setup ProgramTable 2-1 lists the keys that you use to view or change information on the System Setup

Using the System Setup Program 43System Setup OptionsMain ScreenWhen you enter the System Setup program, the main System Setup program screen appears

44 Using the System Setup ProgramTable 2-2. System Setup Program OptionsOption DescriptionSystem Time Sets the time on the system's internal cloc

Using the System Setup Program 45Memory Information ScreenTable 2-3 lists the descriptions for the information fields that appear on the Memory Inform

46 Using the System Setup ProgramCPU Information ScreenTable 2-4 lists the options and descriptions for the information fields that appear on the CPU

Using the System Setup Program 47SATA Configuration ScreenTable 2-5 lists the options and descriptions for the information fields that appear on the S

48 Using the System Setup ProgramIntegrated Devices ScreenTable 2-6 lists the options and descriptions for the information fields that appear on the I

Using the System Setup Program 49Serial Communication ScreenTable 2-7 lists the options and descriptions for the information fields that appear on the

Contents 5System Cover. . . . . . . . . . . . . . . . . . . . . . . 66Removing the System Cover . . . . . . . . . . . . 66Installing the System Co

50 Using the System Setup ProgramSystem Security ScreenTable 2-8 lists the options and descriptions for the information fields that appear on the Syst

Using the System Setup Program 51TPM Security(Off default)NOTE: The TPM Security feature is not available in China.Sets the reporting of the Trusted P

52 Using the System Setup ProgramExit ScreenAfter you press <Esc> to exit the System Setup program, the Exit screen displays the following optio

Using the System Setup Program 53System and Setup Password Features NOTICE: The password features provide a basic level of security for the data on y

54 Using the System Setup ProgramWhen a system password is not assigned and the password jumper on the system board is in the enabled (default) positi

Using the System Setup Program 55When the Password Status option is set to Unlocked, you have the option to leave the password security enabled or to

56 Using the System Setup Program4When prompted, type the system password.5Confirm that Not Enabled is displayed for the System Password option. If No

Using the System Setup Program 57Operating With a Setup Password EnabledIf Setup Password is set to Enabled, you must enter the correct setup password

58 Using the System Setup Program• Functions independently of the system’s power state or the system’s operating system• Provides text console redirec

Installing System Components 59Installing System ComponentsThis section describes how to install the following system components:• Front bezel• System

6 ContentsInstalling an Expansion Card . . . . . . . . . . . . 95SAS Controller Card . . . . . . . . . . . . . . . . . . . 96Removing a SAS Contro

60 Installing System ComponentsRecommended ToolsThe procedures in this section may require one or more of the following tools:• Small Phillips screwdr

Installing System Components 61Figure 3-1. Inside View of the System1 system cover 2 processor airflow shroud3 system fan 4 power supplies5 power dist

62 Installing System ComponentsThe system board in your system supports a single processor, five expansion cards, and six memory modules. Internal har

Installing System Components 63Removing the Front Bezel1Using the system key, unlock the front bezel (if locked).Figure 3-2. Locking and Unlocking the

64 Installing System ComponentsFigure 3-3. Removing and Installing the Front BezelInstalling the Front Bezel1Insert the tabs on the front bezel into t

Installing System Components 65Front Bezel InsertsRemoving a Front Bezel Insert NOTE: Before installing a drive in one or more of the front drive bay

66 Installing System ComponentsInstalling a Front Bezel Insert NOTE: If you remove a drive from one or more of the front drive bays, replace the corr

Installing System Components 67Figure 3-5. Removing and Installing the System CoverInstalling the System Cover1Ensure that all internal cables are con

68 Installing System Components6Using a small flat-blade screwdriver, turn the release latch lock on the cover release latch clockwise to the locked p

Installing System Components 69Figure 3-6. Removing and Installing a Blank Drive EMI FillerInstalling an EMI Filler NOTE: If you remove a drive from

Contents 7Removing the Chassis Intrusion Switch . . . . . . 121Installing the Chassis Intrusion Switch . . . . . . 123Power Supply Distribution Modu

70 Installing System ComponentsRemoving the Processor Airflow Shroud CAUTION: Many repairs may only be done by a certified service technician. You sh

Installing System Components 714If present, remove the cable from the cable guides and fold the SAS cable away from the processor airflow shroud.5Pres

72 Installing System ComponentsInstalling the Processor Airflow Shroud NOTICE: Ensure that all SATA/SAS cables are folded out of the way and that all

Installing System Components 73Removing a Redundant Power Supply NOTICE: The system requires one power supply to operate the system normally. On powe

74 Installing System ComponentsFigure 3-9. Removing and Installing a Redundant Power Supply1 locking tab 2 power supply handle3 cable retention bracke

Installing System Components 75Installing a Redundant Power Supply NOTE: When installing a redundant power supply, allow several seconds for the syst

76 Installing System Components5Remove the screw that secures the power supply to the system.6Press the power supply release tab and slide the power s

Installing System Components 77Installing a Non-Redundant Power Supply1Slide the power supply into the back of the chassis until the power supply rele

78 Installing System Components3 Squeeze the tabs on the hard drive carrier release handle, then rotate the handle down to release the drive.4Slide th

Installing System Components 79 NOTICE: Combining SATA and SAS hard drives in the same system configuration is not supported.1Unpack the hard drive a

8 ContentsTroubleshooting a Wet System. . . . . . . . . . . . . 141Troubleshooting a Damaged System. . . . . . . . . . 142Troubleshooting the Syst

80 Installing System ComponentsFigure 3-12. Removing and Installing a Hard Drive Carrier5With the handle on the hard drive carrier open, slide the har

Installing System Components 812Remove the system cover (see "Removing the System Cover" on page 66).3Disconnect the data cable and the powe

82 Installing System Components5Replace the system cover (see "Installing the System Cover" on page 67).Installing a Cabled Hard Drive CAUT

Installing System Components 83Figure 3-14. Removing a Hard Drive From a Hard Drive Bracket6Slide the hard drive into the drive bay until it snaps int

84 Installing System Components12Enter the System Setup program and ensure that the hard drive’s controller is enabled (see "Entering the System

Installing System Components 856Slide the drive release latch towards the base of the system to release the shoulder screw, then slide the diskette dr

86 Installing System Components7Replace the processor airflow shroud (see "Installing the Processor Airflow Shroud" on page 72).8Replace the

Installing System Components 87Figure 3-16. Installing Diskette Drive Shoulder Screws 8From the front of the system, align the shoulder screws with th

88 Installing System ComponentsOptical and Tape DrivesThe 5.25-inch drive bays in the front of your system provide support for an optical drive and ei

Installing System Components 89Figure 3-17. Removing and Installing an Optical or Tape Drive (SCSI Connection)1 drive release latch 2 shoulder screws3

Contents 9System Diagnostics Testing Options . . . . . . . . . . 165Using the Custom Test Options . . . . . . . . . . . . . 165Selecting Devices fo

90 Installing System ComponentsFigure 3-18. Removing and Installing an Optical Drive (SATA Connection)7Replace the processor airflow shroud (see "

Installing System Components 91Installing an Optical or Tape Drive CAUTION: Many repairs may only be done by a certified service technician. You sho

92 Installing System ComponentsFigure 3-19. Installing Optical or Tape Drive Shoulder Screws8From the front of the system, align the shoulder screws w

Installing System Components 9312Replace the system cover (see "Installing the System Cover" on page 67).13Replace the front bezel (see &quo

94 Installing System Components NOTE: If you are removing the card permanently, install a filler bracket in the empty card slot. NOTE: Filler bracket

Installing System Components 957Close the expansion card cover (see Figure 3-7).8Replace the system cover (see "Installing the System Cover"

96 Installing System Components7Insert the card into the expansion card connector on the system board and press down firmly (see Figure 3-20). Ensure

Installing System Components 97Removing a SAS Controller Card CAUTION: Only trained service technicians are authorized to remove the system cover and

98 Installing System ComponentsInstalling a SAS Controller Card CAUTION: Many repairs may only be done by a certified service technician. You should

Installing System Components 99 NOTICE: Do not route card cables over or behind the cards. Cables routed over the cards can prevent the system cover