Power Button, Steps | Dell 990 guide

–Ensure that any power strips being used are plugged into an electrical outlet and are turned on.

–Ensure that the electrical outlet is working by testing it with another device, such as a lamp.

–Ensure that the main power cable and front panel cable are securely connected to the system board.

LED

Power Button

Problem Description A possible system board failure has occurred.

Troubleshooting Steps Unplug the computer. Allow one minute for the power to drain.

		Plug the computer into a working electrical outlet and press
		the power button.
	LED
	Power Button
	Problem	A possible system board, power supply, or peripheral failure has
	Description	occurred.
	Troubleshooting	– Power off computer, leaving the computer plugged in.
	Steps	– Power off computer, leaving the computer plugged in.
	Steps	Press and hold the power supply test button at the rear of
		the power supply unit. If the LED next to the switch
		illuminates, the problem may be with your system board.
		– If the LED next to the switch does not illuminate,
		disconnect all internal and external peripherals, and
		press and hold the power supply test button. If it
		illuminates, there could be a problem with a peripheral.
		– If the LED still does not illuminate, remove the PSU
		connections from the system board, then press and hold
		the power supply button. If it illuminates, there could be a
		problem with the system board.

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Dell 990 service manual Power Button, Steps

Contents

Regulatory Model D05D Regulatory Type D05D001 Page Contents Power-Switch Cable Chassis Intrusion SwitchCoin-Cell Battery Speaker System Setup Power SupplyPower Supply Unit PSU Thermal Sensor Troubleshooting Decreasing available memory Memory allocation errorNo timer tick interrupt Diskette read failure Specifications Contacting DellPage Working on Your Computer Before Working Inside Your Computer Recommended Tools Turning Off Your Computer After 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 Bezel Installing The Front Bezel Cards Removing the Expansion CardPage Installing The Expansion Card Page Optical Drive Removing the Optical Drive Installing The Optical Drive Hard Drive Removing the Hard DrivePage Installing The Hard Drive Page Memory Removing the Memory Installing The Memory Chassis Intrusion Switch Removing the Chassis Intrusion Switch Installing The Chassis Intrusion Switch Speaker Removing The Speaker Installing The Speaker Heat Sink Removing The Heat Sink and ProcessorPage Installing The Heat Sink and Processor Page Coin-Cell Battery Removing The Coin-Cell Battery Installing The Coin-Cell Battery Power-Switch Cable Removing The Power-Switch Cable Installing The Power-Switch Cable Front Thermal Sensor Removing The Front Thermal Sensor Installing The Front Thermal Sensor Chassis Fan Removing The System Fan Installing The System Fan Follow the procedures in After Working Inside Your Computer Page Input/Output Panel Removing The Input/Output Panel Installing The Input/Output Panel Remove the Input/Output panel Power Supply Removing The Power SupplyPage Installing The Power Supply Lift the power supply out of the computerPage System Board Removing The System Board Installing The System Board Follow the procedures in After Working Inside Your Computer Page Power Supply Unit PSU Thermal Sensor Removing The PSU Thermal Sensor Installing The PSU Thermal Sensor Boot Menu System SetupSystem Setup Boot Menu Enhancements Timing Key Sequences Navigation Beep Codes and Text Error MessagesSystem Setup Options Technology SATA-2, SATA-3, and LOM MAC Address System Configuration Video Security Allow Non-Admin Password Changes This option is Performance Power Management Protector or if Auto Power is set to disabled Enable F12 Boot menu enabled by default Post Behavior Image Server MaintenanceVirtualization Support Address is System Logs Setting is255.255.255.255 Displays the Bios Progress event log Clear LogPage Diagnostic Light Patterns TroubleshootingDiagnostic LEDs Power Button Problem Power Button Steps Power Button Problem Description LED If the problem persists, the system board is faulty Troubleshooting Steps Re-seat the processor Troubleshooting Steps Your computer Possible expansion card failure has occurred Beep Codes Code1-1-2 Code Cause DMA page register read/write failure Through CauseCode Cause Code Cause 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 error Decreasing available memory Diskette subsystem reset failedHard-disk drive configuration error Diskette drive 0 seek failure Hard-disk drive controller failure Invalid configuration information-please run Setup programInvalid Memory configuration, please populate DIMM1 Hard-disk drive failure Memory allocation error Memory size in Cmos invalid No timer tick interrupt No boot device availableNo boot sector on hard-disk drive Non-system disk or disk error Seek error Read faultReset failed Requested sector not found Unexpected interrupt in protected mode Time-of-day not set-please run the System Setup programTimer chip counter 2 failed Write fault Write fault on selected drive \ is not accessible. The device is not readyPage Processor SpecificationsTechnical Specifications Type System Information AudioNetwork Expansion Bus PCI External Connectors Drives Factor Back Panel Ultra Small Form Factor Front Panel Video ConnectorSystem Board Connectors Vary based on the graphics card Small Form Factor Ultra Small Form Factor Controls and Lights Turned on and is functional. Power system bySystem power supply Outlet Environmental 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 102 Visit support.dell.com Contacting DellContacting Dell