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, 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.
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 for more information.
2. Replace the system board.
Table C-2 Diagnostic Front Panel LEDs and Audible Codes (continued)
Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 189
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