Dell PowerEdge 500SC - Manual (Page 29)

If the keyboard and its cable appear to be free of physical damage, and the keys work, go to step 4.
If the keyboard or its cable are damaged, continue to step 3.
3. Swap the faulty keyboard with a working keyboard.
If the problem is resolved, the keyboard must be replaced. See " Getting Help ," for instructions on obtaining technical assistance.
4. Run the keyboard test in the system diagnostics.
If you can use the keyboard to select the keyboard test, go to step 6.
If you cannot use the keyboard to select the keyboard test, continue to step 5.
5. Swap the faulty keyboard with a working keyboard.
6. Did the keyboard test run successfully?
If the problem is resolved, the keyboard must be replaced. If the problem is not resolved, the keyboard controller on the system board is faulty. See
"
Getting Help ," for instructions on obtaining technical assistance.
Troubleshooting the Basic I/O Functions
Problem
l A system error message indicates an I/O port problem
l A device connected to the port does not function properly
Action
1. Check the system setup. See "Using the System Setup Program" in the User's Guide for instructions.
If the system setup is correct, go to step 4.
2. Change the necessary statements in the system setup. If the port problem is confined to a particular application program, see the application
program's documentation for specific port configuration requirements.
3. Reboot the system from the diagnostics diskette, and run the serial port test and/or the parallel port test in the system diagnostics.
If the tests did not run successfully, see " Getting Help ," for instructions on obtaining technical assistance.
4. If the problem persists, see one of the following procedures, " Troubleshooting a Parallel Printer " or " Troubleshooting a Serial I/O Device ," depending on
the malfunctioning device.
Troubleshooting a Serial I/O Device
Problem
l Device connected to the serial ports is not working
Action
1. Turn off the system and any peripheral devices connected to the serial port.
2. Swap the interface cable with a known working cable.
If the problem is resolved, the interface cable must be replaced. See " Getting Help ," for instructions on obtaining technical assistance.
3. Turn off the system and the serial device, and swap the device with a comparable device.
4. Turn on the power to the system and the serial device.
If the problem is resolved, the serial device must be replaced. If the problem is not resolved, see " Getting Help ," for instructions on obtaining technical
assistance.
Troubleshooting a Parallel Printer
Problem
l Parallel printer is not working
Action
1. Turn off the power from the printer and the system.
2. Swap the parallel printer interface cable with a known working cable.
3. Turn on the power to the printer and the system.
4. Attempt to print with the printer.
If the print operation is successful, the interface cable must be replaced. See " Getting Help ," for instructions on obtaining technical assistance.
5. Run the printer's self-test.