Troubleshooting Your Computer, Diagnostic LEDs

Troubleshooting Your Computer

You can troubleshoot your computer using indicators like Diagnostic Lights, Beep Codes, and Error Messages during the operation of the computer.

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.

Each LED has two possible states of OFF or ON. The most significant bit is labeled with the number 1, and the other three are labeled 2, 3, and 4, as you go down or across the LED stack. The normal operating condition after POST is for all four LEDs to be ON and then turn off as the BIOS hands control over to the operating system.

NOTE: The diagnostic lights will blink when the power button is amber or off, and will not blink when it is white.

Table 11. POST Diagnostic LED Patterns

Diagnostic LEDs

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

• The computer is booted and operating normally.

PCI device configuration activity is in progress or PCI device failure was detected.

•If the computer is turned off , connect the AC power-supply and power-on the computer.

•Remove all peripheral cards from the PCI and PCI-E slots and reboot the computer. If the computer boots, add the peripheral cards back one by one until you find the bad one.

	A possible processor failure has	• Re-seat the processor.
	occurred.	• Re-seat the processor.
	occurred.
	Memory modules are detected, but a	• If two or more memory
	memory power failure has occurred.	• If two or more memory
	memory power failure has occurred.	modules are installed, remove
		the modules, then reinstall
		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

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