Troubleshooting Guide

Activity Beeps Possible Cause Recommended Action
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 drives, 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.
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, once every second,
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue
until problem is solved.
6 Pre-video graphics error. 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.
Red 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.
7 System board failure
(ROM detected failure
prior to video).
Replace the system board.
Red 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.
8 Invalid ROM based on bad
checksum.
1. Reflash the system ROM with the latest BIOS
image. See the “Boot Block Emergency
Recovery Mode” section of the Desktop
Management Guide on the Documentation
and Diagnostics CD for more information.
2. Replace the system board.
Red Power LED flashes nine
times, once every second,
followed by a two second
9 System powers on but is
unable to boot.
1. Replace the system board.
2. Replace the processor.
Table A-2 Diagnostic Front Panel LEDs and Audible Codes (continued)
ENWW Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 55