Dell 990 service manual Power Button Problem Description

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–If the LED still does not illuminate, the problem is with the power supply.

LED

Power Button

Problem

Description

Troubleshooting Steps

LED

Power Button

Memory modules are detected, but a memory power failure has occurred.

–If two or more memory modules are installed, remove the modules, then re-install one module and re-start the computer. If the computer starts normally, continue to install additional memory modules (one at a time) until you have identified a faulty module or reinstalled all modules without error. If only one memory module is installed, try moving it to a different DIMM connector and re-start the computer.

–If available, install verified working memory of the same type into your computer.

Problem Description BIOS may be corrupt or missing.

Troubleshooting Steps The computer hardware is operating normally but the BIOS may be corrupt or missing.

LED

Power Button

75

Image 75

Contents Regulatory Model D05D Regulatory Type D05D001 Page Contents Speaker Chassis Intrusion SwitchCoin-Cell Battery Power-Switch CableTroubleshooting Power SupplyPower Supply Unit PSU Thermal Sensor System SetupDiskette read failure Memory allocation errorNo timer tick interrupt Decreasing available memoryContacting Dell SpecificationsPage Before Working Inside Your Computer Working on Your ComputerTurning Off Your Computer Recommended ToolsAfter Working Inside Your Computer Page Installing The Cover CoverRemoving the Cover Follow the procedures in After Working Inside Your Computer Removing the Front Bezel Front BezelInstalling The Front Bezel Removing the Expansion Card CardsPage Installing The Expansion Card Page Removing the Optical Drive Optical DriveInstalling The Optical Drive Removing the Hard Drive Hard DrivePage Installing The Hard Drive Page Removing the Memory MemoryInstalling The Memory Removing the Chassis Intrusion Switch Chassis Intrusion SwitchInstalling The Chassis Intrusion Switch Removing The Speaker SpeakerInstalling The Speaker Removing The Heat Sink and Processor Heat SinkPage Installing The Heat Sink and Processor Page Removing The Coin-Cell Battery Coin-Cell BatteryInstalling The Coin-Cell Battery Removing The Power-Switch Cable Power-Switch CableInstalling The Power-Switch Cable Removing The Front Thermal Sensor Front Thermal SensorInstalling The Front Thermal Sensor Removing The System Fan Chassis FanInstalling The System Fan Follow the procedures in After Working Inside Your Computer Page Removing The Input/Output Panel Input/Output PanelRemove the Input/Output panel Installing The Input/Output PanelRemoving The Power Supply Power SupplyPage Lift the power supply out of the computer Installing The Power SupplyPage Removing The System Board System BoardInstalling The System Board Follow the procedures in After Working Inside Your Computer Page Removing The PSU Thermal Sensor Power Supply Unit PSU Thermal SensorInstalling The PSU Thermal Sensor Boot Menu Enhancements System SetupSystem Setup Boot MenuTiming Key Sequences Beep Codes and Text Error Messages System Setup OptionsNavigation SATA-2, SATA-3, and LOM MAC Address TechnologySystem Configuration Security VideoAllow Non-Admin Password Changes This option is Performance Protector or if Auto Power is set to disabled Power ManagementPost Behavior Enable F12 Boot menu enabled by defaultAddress is MaintenanceVirtualization Support Image ServerSetting is 255.255.255.255System Logs Clear Log Displays the Bios Progress event logPage Power Button Problem TroubleshootingDiagnostic LEDs Diagnostic Light PatternsSteps Power ButtonPower Button Problem Description LED Troubleshooting Steps Re-seat the processor If the problem persists, the system board is faultyTroubleshooting Steps Possible expansion card failure has occurred Your computerCode1-1-2 Beep CodesCode CauseCode Cause Code Cause DMA page register read/write failure ThroughCause Keyboard Controller Test failure Code Error Messages Address mark not foundCode Cause Cache test failure Data error Alert! Security override Jumper is installedBad command or file name Bad error-correction code ECC on disk readDiskette drive 0 seek failure Diskette subsystem reset failedHard-disk drive configuration error Decreasing available memoryHard-disk drive failure Invalid configuration information-please run Setup programInvalid Memory configuration, please populate DIMM1 Hard-disk drive controller failureMemory size in Cmos invalid Memory allocation errorNon-system disk or disk error No boot device availableNo boot sector on hard-disk drive No timer tick interruptRequested sector not found Read faultReset failed Seek errorWrite fault Time-of-day not set-please run the System Setup programTimer chip counter 2 failed Unexpected interrupt in protected mode\ is not accessible. The device is not ready Write fault on selected drivePage Type SpecificationsTechnical Specifications ProcessorExpansion Bus AudioNetwork System InformationPCI Drives External ConnectorsVary based on the graphics card ConnectorSystem Board Connectors Factor Back Panel Ultra Small Form Factor Front Panel VideoSmall Form Factor Ultra Small Form Factor Controls and Lights Outlet Power system bySystem power supply Turned on and is functional.Power Wattage Maximum Voltage Heat Dissipation Physical Height Width Depth WeightEnvironmental 102 Storage Grms Maximum shock Operating 40 G 105 G AltitudeAirborne contaminant level S71.04-1985Contacting Dell Contacting DellVisit support.dell.com