Table 10-2Diagnostic front panel LEDs and audible codes (continued)

Activity

Beeps

Possible Cause

Recommended Action

 

 

 

 

 

Red Power LED flashes two

2

Processor thermal

1.

Ensure that the computer air vents are not

times, once every second,

 

protection activated:

 

blocked and the processor cooling fan is

followed by a two second pause.

 

A fan may be blocked or not

 

running.

Beeps stop after fifth iteration

 

 

 

 

turning.

2.

Open hood, press power button, and see if the

but LEDs continue until problem

 

 

 

 

processor fan spins. If the processor fan is not

is solved.

 

OR

 

 

 

spinning, make sure the fan's cable is plugged

 

 

 

 

 

 

 

 

 

The heat sink/fan assembly

 

onto the system board header.

 

 

 

 

 

 

is not properly attached to

3.

If fan is plugged in, but is not spinning, then

 

 

the processor.

 

 

 

replace heat sink/fan assembly.

 

 

 

 

 

 

 

4.

Contact an authorized reseller or service

 

 

 

 

provider.

 

 

 

 

 

Red Power LED flashes three

3

Processor not installed (not

1.

Check to see that the processor is present.

times, once every second,

 

an indicator of bad

2.

Reseat the processor.

followed by a two second pause.

 

processor).

 

 

 

Beeps stop after fifth iteration

 

 

 

 

but LEDs continue until problem

 

 

 

 

is solved.

 

 

 

 

 

 

 

 

 

Red Power LED flashes four

4

Power failure (power supply

1.

Open the hood and ensure the 4 or 6-wire

times, once every second,

 

is overloaded).

 

power supply cable is seated into the

followed by a two second pause.

 

 

 

connector on the system board.

Beeps stop after fifth iteration

 

 

2.

Check if a device is causing the problem by

but LEDs continue until problem

 

 

 

 

 

removing ALL attached devices. Power on the

is solved.

 

 

 

 

 

 

system. If the system enters the POST, then

 

 

 

 

 

 

 

 

power off and replace one device at a time and

 

 

 

 

repeat this procedure until failure occurs.

 

 

 

 

Replace the device that is causing the failure.

 

 

 

 

Continue adding devices one at a time to

 

 

 

 

ensure all devices are functioning properly.

 

 

 

3.

Replace the power supply.

 

 

 

4.

Replace the system board.

 

 

 

 

Red Power LED flashes five

5

Pre-video memory error.

CAUTION: To avoid damage to the DIMMs or the

times, once every second,

 

 

system board, you must unplug the computer power

followed by a two second pause.

 

 

cord before attempting to reseat, install, or remove

Beeps stop after fifth iteration

 

 

a DIMM module.

but LEDs continue until problem

 

 

1.

Reseat DIMMs.

is solved.

 

 

 

 

 

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.

 

 

 

 

Red Power LED flashes six times,

6

Pre-video graphics error.

For systems with a graphics card:

once every second, followed by

 

 

1.

Reseat the graphics card.

a two second pause. Beeps stop

 

 

 

 

 

 

after fifth iteration but LEDs

 

 

2.

Replace the graphics card.

continue until problem is solved.

 

 

 

 

 

 

 

 

 

3.

Replace the system board.

For systems with integrated graphics, replace the system board.

Interpreting POST diagnostic front panel LEDs 107