Dell Precision Workstation T5610 Owner's Manual

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 1. POST Diagnostic LED Patterns
Diagnostic LEDs
	The computer is either turned off or is not receiving power The computer is booted and operating normally.	If the computer is turned off , connect the AC power-supply and power-on the computer.
	PCI device configuration activity is in progress or PCI device failure was detected.	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 occurred.	Re-seat the processor.
	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 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 installed, try moving it to a different DIMM connector and re-start the computer. If available, install verified working memory of the same type into your computer.
	A possible graphics card failure has occurred.	Ensure that the display/monitor is plugged into a discrete graphic card. Re-seat any installed graphics cards. If available, install a working graphics card into your computer.
	A possible hard drive failure has occurred.	Re-seat 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, 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 available, install working memory of the same type into your computer.
	Power connector not installed properly.	Re-seat the 2x2 power connector from the power supply unit.
	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 system board resource and/or hardware failure has occurred.	Clear CMOS (Re-seat the coin-cell battery. See Removing and Installing Coin-cell Battery). 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 faulty.
	A possible system board failure has occurred.	Disconnect all internal and external peripherals, and re-start 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 faulty.
	Some other failure has occurred.	Ensure that the display/monitor is plugged into a discrete graphic card. Ensure that all hard drives 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 is in Recovery Mode	BIOS checksum failure was detected and the system is now in recovery mode.
	Boot hand off	Indicates end of POST process. LEDs are normally in this state briefly as POST completes. Once the hand-off to the operating system is done, the LEDs turn off .

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Dell Precision Workstation T5610 Owner's Manual

Diagnostic LEDs

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