IBM MICRO TOWER 2169 - Manual (Page 86)

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Table 2-3 Error Symptoms List
Error Symptoms Action/FRU
NOTE: To diagnose a problem, first find the error symptom
in the left column. If directed to a check procedure, replace the
FRU indicated in the check procedure. If no check procedure
is indicated, the first Action/FRU listed in right column is the
most likely cause.
Display problem:
- Incorrect colors
- No high intensity
- Missing, broken,
or
incorrect
characters
- Blank
monitor(dark)
- Blank
monitor(bright)
- Distorted image
- Unreadable
monitor
- Other monitor
problems
Monitor signal connection/cable.
Monitor
System board
Display changing
colors.
Monitor signal connection/cable
Monitor
System board
Display problem not
listed above
(including blank or
illegible monitor).
"Monitor" on page 102.
Load default settings (if screen is
readable).
System board
Parallel
NOTE: Execute “Load BIOS Default Settings” in BIOS Setup
to confirm ports’ presence before diagnosing any parallel/serial
ports problems.
Serial or parallel port
loop-back test
failed.
Make sure that the LPT# or COM# you
test is the same as is set in BIOS
Setup.
Loop-back.
System board.