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3. If the problem is resolved, restart the system, open the System Setup page, and check if the non-
functioning USB ports are enabled.
4. Replace the keyboard or mouse with another working keyboard or mouse.
5. If the problem is resolved, replace the faulty keyboard or mouse.
6. If the problem is not resolved, proceed to the next step to begin troubleshooting the other USB
drives attached to the system.
7. Turn off all attached USB drives and disconnect them from the system.
8. Restart the system and, if your keyboard is functioning, go to the System Setup page. Verify that all
USB ports are enabled on the Integrated Devices page, in the System Setup options.
If your keyboard is not functioning, you can also use remote access. If the system is not accessible,
reset the NVRAM_CLR jumper inside your system and restore the BIOS to the default settings.
9. Reconnect and turn on each USB drives, one at a time.
10. If a device causes the same problem, turn off the device, replace the USB cable with a known good
cable, and turn on the device.
If all troubleshooting tasks are unsuccesful, see Getting help in this document.
Troubleshooting serial I/O device
1. Turn off the system and any peripheral devices connected to the serial port.
2. Swap 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 with a known good cable.
3. Turn off the system and the serial device, and swap the device with a comparable device.
4. Turn on the system and the serial device.
If the issue persists, see Getting help in this document.
Troubleshooting NIC
1. Run the appropriate diagnostic test. For information about available diagnostic tests, see Using
system diagnostics in this document.
2. Restart the system and check for any system messages pertaining to the NIC controller.
3. Check the appropriate indicator on the NIC connector:
• If the link indicator does not glow, check all cable connections.
• If the activity indicator does not glow, the network driver files might be damaged or missing.
Remove and reinstall the drivers if applicable. See the NIC's documentation.
• If applicable, change the autonegotiation setting.
• Use another connector on the switch or hub.
4. Make sure that the appropriate drivers are installed and the protocols are bound. See the NIC's
documentation.
5. Enter the System Setup and confirm that the NIC ports are enabled on the Integrated Devices page.
6. Make sure that the NICs, hubs, and switches on the network are all set to the same data transmission
speed and duplex mode. See the documentation for each network device.
7. Make sure that all network cables are of the proper type and do not exceed the maximum length.
If all troubleshooting tasks are unsuccessful, see Getting help in this document.
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