Dell R300 owner manual Troubleshooting a Serial I/O Device, Troubleshooting a USB Device

3Run the appropriate online diagnostic test. See "Running the System Diagnostics" on page 151.

If the tests run successfully but the problem persists, see "Troubleshooting a USB Device" on page 127.

Troubleshooting a Serial I/O Device

Problem

•Device connected to the serial port is not operating properly.

Action

1Turn off the system and any peripheral devices connected to the serial port.

2Swap the serial interface cable with a working cable, and turn on the system and the serial device.

If the problem is resolved, replace the interface cable. See "Getting Help" on page 165.

3Turn off the system and the serial device, and swap the device with a comparable device.

4Turn on the system and the serial device.

If the problem is resolved, replace the serial device. See "Getting Help" on page 165.

If the problem persists, see "Getting Help" on page 165.

Troubleshooting a USB Device

Problem

•System message indicates a problem with a USB device.

•One or more USB devices are not operating properly.

Troubleshooting Your System

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