Change the Serial Port and Parallel Port Mode options to the appropriate settings and then reboot the system

Is the problem resolved?

Yes. The problem is resolved.

3. Check the contents of your initialization and start-up files. (See "Installing and Configuring Software" found earlier in this chapter.)

Are the port configuration commands correct?

4. Change the necessary statements in the start-up files.

If the port problem is confined to a particular application program, see the application program's documentation for specific port configuration requirements.

Is the problem resolved?

Yes. The problem is resolved.

5. Insert your diagnostics diskette into drive A, reboot the computer, and run the Serial Ports device group and/or the Parallel Ports device group in the Dell Diagnostics. (See "Running the Dell Diagnostics" found later in this chapter.)

The Serial Ports device group and the Parallel Ports device group check the basic functions of the system board's I/O port logic. Also, if a parallel printer is connected to the parallel port, the Parallel Ports device group tests the communication link between the system board's I/O port logic and the printer.

Do the tests complete successfully?

No. Call Dell for technical assistance. (See Chapter 5, "Getting Help," for instructions.)

6. If the problem persists, go to "Troubleshooting a Parallel Printer" or "Troubleshooting a Serial I/O Device" found later in this chapter.

Troubleshooting a Parallel Printer

If the preceding procedure, "Troubleshooting the Basic I/O Functions," indicates that the problem is with a parallel printer, perform the following steps:

1. Turn off the parallel printer and computer.

2. Swap the parallel printer's interface cable with a known working cable.

3. Turn on the parallel printer and computer.

4. Attempt a print operation on the parallel printer. Does the print operation complete successfully?

Yes. You probably need a new interface cable. Call Dell for technical assistance. (See Chapter 5, "Getting Help," for instructions.)

5. Run the parallel printer's self-test.

Does the self-test complete successfully? Yes. Go to step 6.

No. The printer is probably defective. If you bought the printer from Dell, call Dell for technical assistance. (See Chapter 5, "Getting Help," for instructions.) If you purchased the printer elsewhere, take it to one of the manufacturer's authorized service centers for repair.

6. Attempt another print operation on the parallel printer. Does the print operation complete successfully?

Yes. The problem is resolved.

No. Call Dell for technical assistance. (See Chapter 5, "Getting Help," for instructions.)

Troubleshooting a Serial I/O Device

If the procedure titled "Troubleshooting the Basic I/O Functions" found earlier in this section indicates that the problem is with a device connected to one of the serial ports, perform the following steps:

1. Exit any open application programs, and then turn off the computer and the serial device.

2. Swap the device's interface cable with a known working cable.

3. Turn on the computer and the serial device. Is the problem resolved?

Yes. You probably need a new interface cable. Call Dell for technical assistance. (See Chapter 5, "Getting Help," for instructions.)

4. Turn off the computer and the serial device and swap the device with a comparable working device.

For example, if your serial mouse has a problem, swap it with a serial mouse you know is working properly.

5. Turn on the computer and the serial device. Is the problem resolved?

Yes. You probably need a new device. Call Dell for technical assistance. (See Chapter 5, "Getting Help," for instructions.)

No. Call Dell for technical assistance. (See Chapter 5, "Getting Help," for instructions.)

Troubleshooting the Infrared Port

This section provides a procedure for troubleshooting the computer's infrared (IR) port.

Make a copy of the Diagnostics Checklist found in Chapter 5, "Getting Help," and fill it out as you perform the following steps:

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