52 IBM Desktop System HMM
Display problem not listed
above (including blank or
illegible monitor).
1. “Monitor” on page 72.
2. Load default settings
(if screen is readable ).
3. Sy stem board
Parallel/Serial Ports
NOTE: Execute “Load BIOS Default Settings” in
Configuration/Setup U t i l it y to confirm ports' presence
before diagnosing any p ara llel/serial ports prob le ms.
Serial or parallel port loop-
back test failed. 1. M ake sure that the LPT#
or COM# you test is the
same as is set in
Configuration/Setup
Utility
2. Loop-back.
3. Sy stem board.
Printing failed. 1. Ensure that the printer
driver is properly
installed.
2. Re fer to the service
manual for the printer.
3. Printer
4. Printer cable.
5. Sy stem board.
Printer problems. 1. Refer to the service
manual for the printer.
Joystick
Game port does not
respond or does not wor k. 1. C onnect a joystick to the
game port, then execute
“Interactive Test/Joystick”
test in PC-Doctor
diagnostics program.
2. Sy stem board.
Diagnostic Program
Diagnostics programs
cannot be executed. 1. R eboot the system from
the diagnostics diskette.
2. Load default settings.
3. Diagnostics diskette.
4. Memory module.
5. Sy stem board.
Missing diagnostics file(s). 1. Diagnostics diskette.
Keyboard
Some or all keys on
keyboard do not work. 1. “Keyboard” on page 66.
Error Symptoms Action/FRU