Service Reference Guide, dc5100 376220-001 D–31
Red Power LED
flashes three times,
once every second,
followed by a two
second pause and
the computer beeps
three times. Beeps
stop after fifth
iteration but LEDs
continue until
problem is
resolved.
3 Processor not
installed (not an
indicator of bad
processor).
1. Check to see that the processor is
present.
2. Reseat the processor.
Red Power LED
flashes four times,
once every second,
followed by a two
second pause and
the computer beeps
four times. Beeps
stop after fifth
iteration but LEDs
continue until
problem is
resolved.
4 Power failure
(power supply is
overloaded).
1. Open the hood and ensure the 4-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 and
the computer beeps
five times. Beeps
stop after fifth
iteration but LEDs
continue until
problem is
resolved.
5 Pre-video memory
error.
1. Reseat DIMMs. Power on the system.
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.
Diagnostic Front Panel LEDs and Audible Codes (Continued)
Activity Beeps Possible Cause Recommended Action
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