Dell 4691901 owner manual Diagnostic LEDs, Diagnostic Light Patterns, Power Button

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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 Description Troubleshooting Steps

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

•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.

•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

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Contents Regulatory Model D07D Regulatory Type D07D001 Dell Inc Contents Troubleshooting System SetupContacting Dell SpecificationsPage Before Working Inside Your Computer Working on Your ComputerAfter Working Inside Your Computer Turning Off Your ComputerRelated Links Installing The CoverRemoving the Cover Removing the Expansion Card Installing The Front BezelRemoving the Front Bezel Page Removing the Optical Drive Installing The Expansion CardRemoving the Hard Drive Installing The Optical DrivePage Removing the Memory Installing The Hard DriveRemoving the Chassis Intrusion Switch Installing The MemoryRemoving The Speaker Installing The Chassis Intrusion SwitchInstalling The Speaker Removing The Heat Sink and Processor Installing The Heat Sink and Processor Removing The Power-Switch Cable Removing The Coin-Cell BatteryInstalling The Coin-Cell Battery Installing The Power-Switch Cable Removing The Front Thermal Sensor Removing The System Fan Installing The Front Thermal SensorInstalling The System Fan Removing The Input/Output Panel Installing The System FanRemoving The Power Supply Installing The Input/Output PanelDisconnect the 4-pin power cable from the system board Remove the Input/Output panelPage Installing The Power Supply Remove the expansion cards Removing the System BoardRemove the system board from the chassis Installing the System BoardRemoving The PSU Thermal Sensor Installing The PSU Thermal Sensor Boot Menu System SetupBoot Menu Enhancements CtrlAltF8 One-time boot and diagnostics utility menu F12Timing Key Sequences Beep Codes and Text Error MessagesNavigation Action KeystrokeSystem Setup Options Security Password prompts during a system restart Password BypassThey are set. This option is disabled by default Password ChangesPerformance Power ManagementMaintenance Enable F12 Boot menu enabled by defaultPost Behavior Virtualization SupportSystem Logs Power Button Diagnostic LEDsDiagnostic Light Patterns Troubleshooting Steps Power Button Problem Description Re-seat the 2x2 power connector from the power supply unitIf the problem persists, the system board is faulty Possible system board failure has occurredReinstalled all modules without error Problem Description Troubleshooting Steps Code Cause Microprocessor register failure Beep CodesCode Cause Code Cause DMA initialization failureCode Through Cause Address mark not found Error MessagesCode Cause No time tick Shutdown failure Gate A20 failure Code Cause Time-of-day clock stoppedBad command or file name Alert! Security override Jumper is installedBad error-correction code ECC on disk read Data errorHard-disk drive configuration error Diskette subsystem reset failedDiskette drive 0 seek failure Diskette read failureInvalid Memory configuration, please populate DIMM1 Invalid configuration information-please run Setup programMemory allocation error Keyboard failureNo boot sector on hard-disk drive No boot device availableNo timer tick interrupt Non-system disk or disk errorReset failed Read faultSeek error Time-of-day not set-please run the System Setup programWrite fault Unexpected interrupt in protected modeWrite fault on selected drive \ is not accessible. The device is not readySystem Information SpecificationProcessor MemoryNetwork AudioExpansion Bus CardsSystem Board Connectors External ConnectorsMini-Tower Two Desktop One Small Form Factor Audio Back Panel Mini-Tower/DesktopControls and Lights Environmental Physical Height Width Depth WeightPage Visit support.dell.com Contacting Dell