Interpreting Post Diagnostic Front Panel Leds - HP Pro 4300 Maintenance And Service Manual

Interpreting POST Diagnostic Front Panel LEDs

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!
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.
Table 8-2 Diagnostic Front Panel LEDs and Audible Codes
Activity
White 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.
White Power LED flashes
six times, once every
second, followed by a two
second pause. Beeps stop
after fifth iteration but
LEDs continue until
problem is solved.
White Power LED flashes
seven times, once every
second, followed by a two
second pause. Beeps stop
after fifth iteration but
LEDs continue until
problem is solved.
White Power LED flashes
eight times, once every
second, followed by a two
second pause. Beeps stop
after fifth iteration but
LEDs continue until
problem is solved.
When the computer is plugged into an AC power source, voltage is always applied to
Blink Possible Cause
s
5 Pre-video memory error.
6 Pre-video graphics error.
7 System board failure (ROM
detected failure prior to
video).
8 Invalid ROM based on bad
checksum.
Recommended Action
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.
For systems with a graphics card:
1. Reseat the graphics card.
2. Replace the graphics card.
3. Replace the system board.
For systems with integrated graphics, replace the
system board.
Replace the system board.
1. Reflash the system ROM with the latest BIOS
image.
2. Replace the system board.
Interpreting POST Diagnostic Front Panel LEDs 115