Troubleshooting, Diagnostic LEDs, Power Button Problem | Dell 990

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Troubleshooting

Diagnostic LEDs

NOTE: The diagnostic LEDs only serve as an indicator of the progress through the Power-on Self-Test (POST) process. These LEDs do not indicate the problem that caused the POST routine to stop.

The diagnostic LEDs are located on the front of the chassis next to the power button. These diagnostic LEDs are only active and visible during the POST process. Once the operating system starts to load, they turn off and are no longer visible.

The system now includes pre-POST and POST LEDs in an attempt to help identifying a possible problem with the system easier and more accurate.

NOTE: The diagnostic lights will blink when the power button is amber or off, and will not blink when it is blue. This has no other significance.

Diagnostic Light Patterns

LED

Power Button

Problem	The computer is either turned off or is not receiving power.
Description

Troubleshooting Steps

–Re-seat the power cable in the power connector at the back of the computer and the electrical outlet.

–Bypass power strips, power extension cables, and other power protection devices to verify that the computer turns on properly.

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Dell 990 service manual Troubleshooting, Diagnostic LEDs, Diagnostic Light Patterns, Power Button Problem, Description

Contents

Regulatory Model D05D Regulatory Type D05D001 Page Contents Coin-Cell Battery Chassis Intrusion SwitchPower-Switch Cable Speaker Power Supply Unit PSU Thermal Sensor Power SupplySystem Setup Troubleshooting No timer tick interrupt Memory allocation errorDecreasing available memory Diskette read failure Contacting Dell SpecificationsPage Before Working Inside Your Computer Working on Your Computer Turning Off Your Computer Recommended Tools After Working Inside Your Computer Page Cover Installing The CoverRemoving the Cover Follow the procedures in After Working Inside Your Computer Removing the Front Bezel Front Bezel Installing The Front Bezel Removing the Expansion Card CardsPage Installing The Expansion Card Page Removing the Optical Drive Optical Drive Installing The Optical Drive Removing the Hard Drive Hard DrivePage Installing The Hard Drive Page Removing the Memory Memory Installing The Memory Removing the Chassis Intrusion Switch Chassis Intrusion Switch Installing The Chassis Intrusion Switch Removing The Speaker Speaker Installing The Speaker Removing The Heat Sink and Processor Heat SinkPage Installing The Heat Sink and Processor Page Removing The Coin-Cell Battery Coin-Cell Battery Installing The Coin-Cell Battery Removing The Power-Switch Cable Power-Switch Cable Installing The Power-Switch Cable Removing The Front Thermal Sensor Front Thermal Sensor Installing The Front Thermal Sensor Removing The System Fan Chassis Fan Installing The System Fan Follow the procedures in After Working Inside Your Computer Page Removing The Input/Output Panel Input/Output Panel Remove the Input/Output panel Installing The Input/Output Panel Removing The Power Supply Power SupplyPage Lift the power supply out of the computer Installing The Power SupplyPage Removing The System Board System Board Installing The System Board Follow the procedures in After Working Inside Your Computer Page Removing The PSU Thermal Sensor Power Supply Unit PSU Thermal Sensor Installing The PSU Thermal Sensor System Setup System SetupBoot Menu Boot Menu Enhancements Timing Key Sequences System Setup Options Beep Codes and Text Error MessagesNavigation SATA-2, SATA-3, and LOM MAC Address Technology System Configuration Security Video Allow Non-Admin Password Changes This option is Performance Protector or if Auto Power is set to disabled Power Management Post Behavior Enable F12 Boot menu enabled by default Virtualization Support MaintenanceImage Server Address is 255.255.255.255 Setting isSystem Logs Clear Log Displays the Bios Progress event logPage Diagnostic LEDs TroubleshootingDiagnostic Light Patterns Power Button Problem Steps Power Button Power Button Problem Description LED Troubleshooting Steps Re-seat the processor If the problem persists, the system board is faulty Troubleshooting Steps Possible expansion card failure has occurred Your computer Code1-1-2 Beep Codes Code Cause CauseCode Cause DMA page register read/write failure Through Code Cause Keyboard Controller Test failure Code Address mark not found Error MessagesCode Cause Cache test failure Bad command or file name Alert! Security override Jumper is installedBad error-correction code ECC on disk read Data error Hard-disk drive configuration error Diskette subsystem reset failedDecreasing available memory Diskette drive 0 seek failure Invalid Memory configuration, please populate DIMM1 Invalid configuration information-please run Setup programHard-disk drive controller failure Hard-disk drive failure Memory size in Cmos invalid Memory allocation error No boot sector on hard-disk drive No boot device availableNo timer tick interrupt Non-system disk or disk error Reset failed Read faultSeek error Requested sector not found Timer chip counter 2 failed Time-of-day not set-please run the System Setup programUnexpected interrupt in protected mode Write fault \ is not accessible. The device is not ready Write fault on selected drivePage Technical Specifications SpecificationsProcessor Type Network AudioSystem Information Expansion Bus PCI Drives External Connectors System Board Connectors ConnectorFactor Back Panel Ultra Small Form Factor Front Panel Video Vary based on the graphics card Small Form Factor Ultra Small Form Factor Controls and Lights System power supply Power system byTurned on and is functional. Outlet Physical Height Width Depth Weight Power Wattage Maximum Voltage Heat DissipationEnvironmental Airborne contaminant level Storage Grms Maximum shock Operating 40 G 105 G AltitudeS71.04-1985 102 Contacting Dell Contacting DellVisit support.dell.com