46 IBM Desktop System HMM
Display changing colors. 1. Monitor signal
connection/cable
2. Monitor
3. System board
Display problem not listed
above (including blank or
illegible monitor).
1. “Monitor” on page 66.
2. Load default settings
(if screen is readable).
3. System board
Parallel/Serial Ports
NOTE:
Execute “Load BIOS Default Settings” in
Configuration/Setup Utility to confirm ports' presence
before diagnosing any parallel/serial ports problems.
Serial or parallel port loop-
back test failed.
1. Make sure that the
LPT# or COM# you test
is the same as is set in
Configuration/Setup
Utility.
2. Loop-back.
3. System board.
Printing failed. 1. Ensure that the printer
driver is properly
installed.
2. Refer to the service
manual for the printer.
3. Printer.
4. Printer cable.
5. System board.
Printer problems. 1. Refer to the service
manual for the printer.
Joystick
Game port does not
respond or does not work.
1. Connect a joystick to
the game port, then
execute “Interactive
Test/Joystick” test in
PC-Doctor diagnostics
program.
2. System board.
Error Symptoms Action/FRU
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