HP 280 G1 Specifications download pdf (Page 108)

Interpreting POST diagnostic front panel LEDs and audible codes

This section covers the front panel LED codes as well as the audible codes that may occur before or during

POST that do not necessarily have an error code or text message associated with them.

WARNING! When the computer is plugged into an AC power source, voltage is always applied to the system

board. To reduce the risk of personal injury from electrical shock and/or hot surfaces, be sure to disconnect

the power cord from the wall outlet and allow the internal system components to cool before touching.

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.

Not all diagnostic lights and audible codes are available on all models.

Activity Beeps Possible cause Recommended action

White Power LED On. None Computer on. None

White Power LED flashes every

two seconds.

None Computer in Suspend to

RAM mode (some models

only) or normal Suspend

mode.

None required. Press any key or move the mouse to

wake the computer.

Red Power LED flashes two

times, once every second,

followed by a two second pause.

Beeps stop after fifth iteration

but LEDs continue until problem

is solved.

2 Processor thermal

protection activated:

A fan may be blocked or not

turning.

The heat sink/fan assembly

is not properly attached to

the processor.

1. Ensure that the computer air vents are not

blocked and the processor cooling fan is

running.

2. Open hood, press power button, and see if the

processor fan spins. If the processor fan is not

spinning, make sure the fan's cable is plugged

onto the system board header.

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

replace heat sink/fan assembly.

4. Contact an authorized reseller or service

provider.

Red Power LED flashes four

times, once every second,

followed by a two second pause.

Beeps stop after fifth iteration

but LEDs continue until problem

is solved.

4 Power failure (power supply

is overloaded).

1. Open the hood and ensure the 4 or 6-wire

power supply cable is seated into the

connector on the system board.

2. Check if a device is causing the problem by

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

times, once every second,

followed by a two second pause.

Beeps stop after fifth iteration

but LEDs continue until problem

is solved.

5 Pre-video memory error. 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.

100 Chapter 8 POST error messages

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HP 280 G1 Specifications Page 108

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