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Troubleshooting Without Diagnostics
Diagnostic Front Panel LEDs and Audible Codes (Continued)
Activity
Red Power LED
flashes seven
times, once
every second,
followed by a
two second
pause.
Red Power LED
flashes eight
times, once
every second,
followed by a
two second
pause.
System does not
power on and
LEDs are not
flashing.
D–28
Beeps
Possible Cause
7
System board
failure (ROM
detected failure
prior to video).
8
Invalid ROM based
on bad checksum.
None
System unable to
power on.
360201-002
Recommended Action
Replace the system board.
1. Reflash the ROM using a ROMPaq
diskette. See the "ROM Flash" section
of the Desktop Management Guide.
2. Replace the system board.
Press and hold the power button for less
than 4 seconds. If the hard drive LED turns
green, then:
1. Check that the voltage selector,
located on the rear of the power
supply, is set to the appropriate
voltage. Proper voltage setting
depends on your region.
2. Remove the expansion cards one at a
time until the 3.3 V_aux light on the
system board turns on.
3. Replace the system board.
OR
Press and hold the power button for less
than 4 seconds. If the hard drive LED does
not turn on green then:
1. Check that the unit is plugged into a
working AC outlet.
2. Open hood and check that the power
button harness is properly connected
to the system board.
3. Check that both power supply cables
are properly connected to the system
board.
4. Check to see if the 3.3 V_aux light on
the system board is turned on. If it is
turned on, then replace the power
button harness.
5. If the 3.3 V_aux light on the system
board is not turned on, then replace
the power supply.
6. Replace the system board.
Service Reference Guide, dc5000
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