HP t620 Troubleshooting Manual page 54

Table B-3
Activity
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.
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.
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.
46 Appendix B Diagnostics and Troubleshooting
Diagnostic Front Panel LEDs and Audible Codes (continued)
Beeps
4
5
6
Possible Cause Recommended Action
Power failure (power 1.
supply is overloaded).
OR
The incorrect external
power supply adapter is
being used on the unit.
2.
3.
CAUTION:
Pre-video memory error.
modules or the system board, you must unplug the
computer power cord before attempting to reseat,
install, or remove a memory module.
1.
2.
3.
4.
Pre-video graphics error. For systems with a graphics card:
1.
2.
3.
For systems with integrated graphics, replace the
system board.
Check if a device is causing the problem by
removing ALL attached devices. 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.
Replace the power supply.
Replace the system board.
To avoid damage to the memory
Reseat memory modules.
Replace memory modules one at a time to
isolate the faulty module.
Replace third-party memory with HP
memory.
Replace the system board.
Reseat the graphics card.
Replace the graphics card.
Replace the system board.