Interpreting POST Diagnostic Front Panel LEDs

This section covers the front panel LED codes that may occur before or during POST that do not necessarily have an error code or text message associated with them.

NOTE: If you see flashing LEDs on a PS/2 keyboard, look for flashing LEDs on the front panel of the computer and refer to the following table to determine the front panel LED codes.

Recommended actions in the following table are listed in the order in which they should be performed.

Replace the system board or power supply only as the last resort.

Activity

Possible Cause

Recommended Action

 

 

 

 

 

 

Green Power LED On.

Computer on.

None

 

 

 

 

 

 

 

Green Power LED flashes every

Processor thermal protection

1.

Ensure that the computer air vents are not blocked

one second.

activated:

 

and the processor cooling fan is running.

 

A fan may be blocked or not

2.

Open hood, press power button, and see if the

 

turning.

 

processor fan spins. If the processor fan is not

 

OR

 

spinning, make sure the fan's cable is plugged onto

 

 

the system board header. Ensure the fan is fully/

 

The heatsink/fan assembly is

 

properly seated or installed.

 

 

 

 

 

 

 

not properly attached to the

 

 

 

WARNING! Rotating fan blades can

 

processor.

 

 

 

 

 

 

 

cause serious bodily harm. Be sure to keep

 

 

 

 

 

 

 

 

 

 

your hands away from the rotating blades.

 

 

 

 

 

 

 

 

3.

If fan is plugged in and seated properly, but is not

 

 

 

spinning, then replace processor fan.

 

 

4.

Reseat processor heatsink and verify that the fan

 

 

 

assembly is properly attached.

 

 

5.

Contact an authorized reseller or service provider.

 

 

 

 

 

 

Green Power LED flashes every

Computer in Suspend to RAM

Press any key or move the mouse to wake the computer.

two seconds.

mode (some models only) or

 

 

 

 

 

 

normal Suspend mode.

 

 

 

 

 

Green Power LED flashes five

Pre-video memory error.

times, once every second, followed

 

by a two second pause.

 

CAUTION: To avoid damage to the DIMMs or the system board, you must unplug the computer power cord before attempting to reseat, install, or remove a DIMM module.

1.Reseat DIMMs.

2.Replace DIMMs one at a time to isolate the faulty module.

3.Replace third-party memory with HP memory.

4.Replace the system board.

ENWW

Interpreting POST Diagnostic Front Panel LEDs 111