Activity

Beeps

Possible Cause

Recommended Action

 

 

 

 

 

Red Power LED flashes two

2

Thermal protection

1.

Clean the air vents on the front, back, or

times, once every second,

 

activated:

 

any other vented side of the computer.

followed by a two second

 

Air flow is restricted, a fan

2.

Ensure that there is a 10.2 cm (4 in)

pause. Beeps stop after fifth

 

iteration but LEDs continue

 

may not be functioning, or

 

clearance on all vented sides of the

until problem is solved.

 

the heatsink is not

 

computer to permit the required airflow.

 

 

properly attached.

3.

Ensure that computers are not so near

 

 

 

 

 

 

 

each other that they are subject to each

 

 

 

 

other's re-circulated or preheated air.

 

 

 

4.

If the computer is within an enclosure,

 

 

 

 

ensure that there is proper intake and

 

 

 

 

exhaust ventilation for the enclosure.

 

 

 

5.

If a message appears on the screen

 

 

 

 

indicating that a fan is not working, replace

 

 

 

 

the fan.

 

 

 

6.

Ensure that the heat sink is properly

 

 

 

 

attached.

 

 

 

 

 

Red Power LED flashes three

3

Processor not installed

1.

Check to see that the processor is present.

times, once every second,

 

(not an indicator of bad

2.

Reseat the processor.

followed by a two second

 

processor).

pause. Beeps stop after fifth

 

 

 

 

iteration but LEDs continue

 

 

 

 

until problem is solved.

 

 

 

 

 

 

 

 

 

Red Power LED flashes four

4

Power failure (power

1.

Open the hood and ensure the 4 or 6-wire

times, once every second,

 

supply is overloaded).

 

power supply cable is seated into the

followed by a two second

 

 

 

connector on the system board.

pause. Beeps stop after fifth

 

 

2.

Check if a device is causing the problem by

iteration but LEDs continue

 

 

until problem is solved.

 

 

 

removing ALL attached devices (such as

 

 

 

 

hard, diskette, or optical drives, and

 

 

 

 

expansion cards). Power on the 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

times, once every second,

 

 

the system board, you must unplug the computer

followed by a two second

 

 

power cord before attempting to reseat, install, or

pause. Beeps stop after fifth

 

 

remove a DIMM module.

iteration but LEDs continue

 

 

1.

Reseat DIMMs.

until problem 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.

 

 

 

 

 

134 Appendix D POST Error Messages

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Image 141
HP 1105 manual Replace one device at a time