HP dc5100 - Microtower PC Service & Reference Manual page 196

Problem
Blank screen and the
power LED flashes Red five
times, once every second,
followed by a two second
pause, and the computer
beeps five times. Beeps
continue for five iterations
after which the LED flashes
will continue until the
problem is resolved.
Power LED flashes Red six
times, once every second,
followed by a two second
pause, and the computer
beeps six times. Beeps
continue for five iterations
after which the LED flashes
will continue until the
problem is resolved.
Blank screen and the
power LED flashes Red
eight times, once every
second, followed by a two
second pause, and the
computer beeps eight
times. Beeps continue for
five iterations after which
the LED flashes will
continue until the problem
is resolved.
Monitor does not function
properly when used with
energy saver features.
Dim characters.
Blurry video or requested
resolution cannot be set.
D–12
Cause
Pre-video memory error.
Pre-video graphics
error.
Invalid ROM based on
checksum.
Monitor without energy
saver capabilities is
being used with energy
saver features enabled.
The brightness and
contrast controls are not
set properly.
Cables are not properly
connected.
If the graphics controller
was upgraded, the
correct video drivers
may not be loaded.
376220-001
Solution
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.
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.
1. Reflash the ROM using a
ROMPaq diskette.
2. Replace the system board.
Disable monitor energy saver
feature.
Adjust the monitor brightness and
contrast controls.
Check that the graphics cable is
securely connected to the graphics
card and the monitor.
Install the video drivers included in
the upgrade kit.
Service Reference Guide, dc5100