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Dell Optiplex 745 LED Diagnostic Lights – System Lights

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dell-diag_leds_lagacyPower Button LEDs
Power Button LED State Description
Off Off Power is Off. LED is blank.
Blinking Amber Blinking Amber Initial State of LED at power up. Refer to the table below for Blinking Amber pattern diagnostic suggestions and possible failures.
Solid Amber Solid Amber The second state of the LED at power up, indicates that the POWER_GOOD signal is active and it is probable that the power supply is fine.
Blinking White Blinking White System is in a low power state, either S1 or S3. This does not indicate a fault condition.
Solid White Solid White System is in S0 state. This is the normal power states of a functioning machine. The BIOS will turn the LED to this states to indicate it has started fetching op-codes.

 

Power LED and Diagnostic LEDs
Light Pattern Problem
Description		 Suggested Resolution
Diagnostic LEDs Power
Button LED
The computer is either turned off or not receiving power.
  • Reseat the power cable in the power connector on 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.
A possible system board failure has occurred.
  • Unplug the computer. Allow one minute for the power to drain. Plug the computer into a working electrical outlet and press the power button.

Blinking		 A possible system board, power supply, or peripheral failure has occurred.
  • Power off computer, leaving the computer plugged in. Press and hold the power supply test button on 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.
  • If the LED still does not illuminate, the problem is probably with the power supply.
No CPU present.
  • Reinstall the CPU and restart the system. If the computer still fails to boot, inspect the CPU socket for damage.
Memory modules are detected, but a memory power failure has occurred.
  • If two or more memory modules are installed, remove the modules, then reinstall one module and restart 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 restart the computer.
  • If available, install verified working memory of the same type into your computer.
A possible CPU or system board failure has occurred.
  • Replace the CPU with a known good CPU. If the computer still fails to boot, inspect the CPU socket for damage.
BIOS may be corrupt or missing.
  • The computer hardware is operating normally but the BIOS may be corrupt or missing.
A possible system board failure has occurred.
  • Remove all peripheral cards from the PCI and PCI-E slots and restart the computer. If the computer boots, add the peripheral cards back one by one until you find the bad one.
Power connector not installed properly.
  • Reseat the 2×2 power connector from the power supply unit.
Possible peripheral card or system board failure has occurred.
  • Remove all peripheral cards from the PCI and PCI-E slots and restart the computer. If the computer boots, add the peripheral cards back one by one until you find the bad one.
A possible system board failure has occurred.
  • Disconnect all internal and external peripherals, and restart the computer. If the computer boots, add the peripheral cards back one by one until you find the bad one.
  • If the problem persists, the system board is probably bad.
A possible coin cell battery failure has occurred.
  • Remove the coin cell battery for one minute, reinstall the battery, and restart.
The computer is in a normal on condition. The diagnostic lights are not lit after the computer successfully boots to the operating system.
  • Ensure that the display is connected and powered on.
A possible processor failure has occurred.
  • Reseat the processor.
Memory modules are detected, but a memory failure has occurred.
  • If two or more memory modules are installed, remove the modules (see your service manual), then reinstall one module (see your service manual and restart 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 available, install working memory of the same type into your computer.
A possible graphics card failure has occurred.
  • Reseat any installed graphics cards.
  • If available, install a working graphics card into your computer.
A possible floppy drive or hard drive failure has occurred.
  • Reseat all power and data cables.
A possible USB failure has occurred.
  • Reinstall all USB devices and check all cable connections.
No memory modules are detected.
  • If two or more memory modules are installed, remove the modules (see your service manual), then reinstall one module (see your service manual) and restart 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 available, install working memory of the same type into your computer.
Memory modules are detected, but a memory configuration or compatibility error has occurred.
  • Ensure that no special requirements for memory module/connector placement exist.
  • Ensure that the memory you are using is supported by your computer.
A possible expansion card failure has occurred.
  • Determine if a conflict exists by removing an expansion card (not a graphics card) and restarting the computer.
  • If the problem persists, reinstall the card you removed, then remove a different card and restart the computer.
  • Repeat this process for each expansion card installed. If the computer starts normally, troubleshoot the last card removed from the computer for resource conflicts.
A possible system board resource and/or hardware failure has occurred.
  • Clear CMOS.
  • Disconnect all internal and external peripherals, and restart the computer. If the computer boots, add the peripheral cards back one by one until you find the bad one.
  • If the problem persists, the system board / system board component is probably bad.
Another failure has occurred.
  • Ensure that all hard drive and optical drive cables are properly connected to the system board.
  • If there is an error message on the screen identifying a problem with a device (such as the floppy drive or hard drive), check the device to make sure it is functioning properly.
  • If the operating system is attempting to boot from a device (such as the floppy drive or optical drive), check system setup to ensure the boot sequence is correct for the devices installed on your computer.

System Lights

Your power button light and hard-drive light may indicate a computer problem.

Power Light

Problem Description

Suggested Resolution
Solid green Power is on, and the computer is operating normally. On the desktop computer, a solid green light indicates a network connection. No corrective action is required.
Blinking green The computer is in a power-saving mode (Microsoft® Windows® XP). Press the power button, move the mouse, or press a key on the keyboard to wake the computer.
Blinks green several times and then turns off A configuration error exists. Check the diagnostic lights to see if the specific problem is identified (see Diagnostic Lights).
Solid yellow The Dell Diagnostics is running a test, or a device on the system board may be faulty or incorrectly installed. If the Dell Diagnostics is running, allow the testing to complete.If the computer does not boot, contact Dell for technical assistance (see Contacting Dell).
Blinking yellow A power supply or system board failure has occurred. See Power Problems.
Solid green and a beep code during POST A problem was detected while the BIOS was executing. See Beep Codes for instructions on diagnosing the beep code. Also, check the diagnostic lights to see if the specific problem is identified (see Diagnostic Lights).
Solid green power light and no beep code and no video during POST The monitor or the graphics card may be faulty or incorrectly installed. Check the diagnostic lights to see if the specific problem is identified (see Diagnostic Lights).See Video and Monitor Problems.
Solid green power light and no beep code but the computer locks up during POST An integrated system board device may be faulty. Check the diagnostic lights to see if the specific problem is identified (see Diagnostic Lights). If the problem is not identified, contact Dell for technical assistance (see Contacting Dell).

 

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