Dell 990 service manual

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7.Unthread the 24–pin power cable from the chassis clip.

8.Remove the screws that secure the power supply to the back of the computer.

9.Push in on the blue release tab beside the power supply, and slide the power towards the front of the computer.

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Contents Regulatory Model D05D Regulatory Type D05D001 Page Contents Power-Switch Cable Chassis Intrusion SwitchCoin-Cell Battery SpeakerSystem Setup Power SupplyPower Supply Unit PSU Thermal Sensor TroubleshootingDecreasing available memory Memory allocation errorNo timer tick interrupt Diskette read failureSpecifications Contacting DellPage Working on Your Computer Before Working Inside Your ComputerRecommended Tools Turning Off Your ComputerAfter Working Inside Your Computer Page Removing the Cover Installing The CoverCover Follow the procedures in After Working Inside Your Computer Front Bezel Removing the Front BezelInstalling The Front Bezel Cards Removing the Expansion CardPage Installing The Expansion Card Page Optical Drive Removing the Optical DriveInstalling The Optical Drive Hard Drive Removing the Hard DrivePage Installing The Hard Drive Page Memory Removing the MemoryInstalling The Memory Chassis Intrusion Switch Removing the Chassis Intrusion SwitchInstalling The Chassis Intrusion Switch Speaker Removing The SpeakerInstalling The Speaker Heat Sink Removing The Heat Sink and ProcessorPage Installing The Heat Sink and Processor Page Coin-Cell Battery Removing The Coin-Cell BatteryInstalling The Coin-Cell Battery Power-Switch Cable Removing The Power-Switch CableInstalling The Power-Switch Cable Front Thermal Sensor Removing The Front Thermal SensorInstalling The Front Thermal Sensor Chassis Fan Removing The System FanInstalling The System Fan Follow the procedures in After Working Inside Your Computer Page Input/Output Panel Removing The Input/Output PanelInstalling The Input/Output Panel Remove the Input/Output panelPower Supply Removing The Power SupplyPage Installing The Power Supply Lift the power supply out of the computerPage System Board Removing The System BoardInstalling The System Board Follow the procedures in After Working Inside Your Computer Page Power Supply Unit PSU Thermal Sensor Removing The PSU Thermal SensorInstalling The PSU Thermal Sensor Boot Menu System SetupSystem Setup Boot Menu EnhancementsTiming Key Sequences Navigation Beep Codes and Text Error MessagesSystem Setup Options Technology SATA-2, SATA-3, and LOM MAC AddressSystem Configuration Video SecurityAllow Non-Admin Password Changes This option is Performance Power Management Protector or if Auto Power is set to disabledEnable F12 Boot menu enabled by default Post BehaviorImage Server MaintenanceVirtualization Support Address isSystem Logs Setting is255.255.255.255 Displays the Bios Progress event log Clear LogPage Diagnostic Light Patterns TroubleshootingDiagnostic LEDs Power Button ProblemPower Button StepsPower Button Problem Description LED If the problem persists, the system board is faulty Troubleshooting Steps Re-seat the processorTroubleshooting Steps Your computer Possible expansion card failure has occurredBeep Codes Code1-1-2Code Cause DMA page register read/write failure Through CauseCode Cause CodeCause Keyboard Controller Test failure Code Code Cause Cache test failure Error MessagesAddress mark not found Bad error-correction code ECC on disk read Alert! Security override Jumper is installedBad command or file name Data errorDecreasing available memory Diskette subsystem reset failedHard-disk drive configuration error Diskette drive 0 seek failureHard-disk drive controller failure Invalid configuration information-please run Setup programInvalid Memory configuration, please populate DIMM1 Hard-disk drive failureMemory allocation error Memory size in Cmos invalidNo timer tick interrupt No boot device availableNo boot sector on hard-disk drive Non-system disk or disk errorSeek error Read faultReset failed Requested sector not foundUnexpected interrupt in protected mode Time-of-day not set-please run the System Setup programTimer chip counter 2 failed Write faultWrite fault on selected drive \ is not accessible. The device is not readyPage Processor SpecificationsTechnical Specifications TypeSystem Information AudioNetwork Expansion BusPCI External Connectors DrivesFactor Back Panel Ultra Small Form Factor Front Panel Video ConnectorSystem Board Connectors Vary based on the graphics cardSmall Form Factor Ultra Small Form Factor Controls and Lights Turned on and is functional. Power system bySystem power supply OutletEnvironmental Power Wattage Maximum Voltage Heat DissipationPhysical Height Width Depth Weight S71.04-1985 Storage Grms Maximum shock Operating 40 G 105 G AltitudeAirborne contaminant level 102Visit support.dell.com Contacting DellContacting Dell