52 IBM Desktop System HMMDisplay problem not listedabove (including blank orillegible monitor).1. “Monitor” on page 72.2. Load default settings(if screen is readable).3. System boardParallel/Serial PortsNOTE: Execute “Load BIOS Default Settings” inConfiguration/Setup Utility to confirm ports' presencebefore 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 thesame as is set inConfiguration/SetupUtility2. Loop-back.3. System board.Printing failed. 1. Ensure that the printerdriver is properlyinstalled.2. Refer to the servicemanual for the printer.3. Printer4. Printer cable.5. System board.Printer problems. 1. Refer to the servicemanual for the printer.JoystickGame port does notrespond or does not work.1. Connect a joystick to thegame port, then execute“Interactive Test/Joystick”test in PC-Doctordiagnostics program.2. System board.Diagnostic ProgramDiagnostics programscannot be executed.1. Reboot the system fromthe diagnostics diskette.2. Load default settings.3. Diagnostics diskette.4. Memory module.5. System board.Missing diagnostics file(s). 1. Diagnostics diskette.KeyboardSome or all keys onkeyboard do not work.1. “Keyboard” on page 66.Error Symptoms Action/FRU
