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Failures related to I/O buses or serial or parallel I/O ports

Explanation: There is a malfunction related to the I/O bus, or the serial or parallel ports.

Diagnosis: This could be a problem with the I/O port hardware itself, or something connected to an I/O port. It could also be an expansion device in the PC, or the motherboard.

Recommendation:

• Treat as an expansion card problem.
• Troubleshoot the serial port(s).
• Troubleshoot the parallel port(s).
• Troubleshoot the motherboard.

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