Steps
1.
Disconnect the keyboard and/or mouse cables from the system and reconnect them.
2.
If the problem persists, connect the keyboard and/or mouse to another USB port on the system.
3.
If the problem is resolved, restart the system, enter System Setup, and check if the non-functioning
USB ports are enabled.
NOTE: Older operating systems may not support USB 3.0.
4.
Check if USB 3.0 is enabled in System Setup. If enabled, disable it and see if the issue is resolved.
5.
If the problem is not resolved, replace the keyboard and/or mouse with a known working keyboard
or mouse.
If the problem is not resolved, proceed to step 7 to troubleshoot other USB devices attached to the
system.
6.
Turn off all attached USB devices, and disconnect them from the system.
7.
Restart the system.
8.
If your keyboard is functioning, enter System Setup, verify that all USB ports are enabled on the
Integrated Devices
screen. If your keyboard is not functioning, use remote access to enable or
disable the USB options.
9.
Check if USB 3.0 is enabled in System Setup. If it is enabled, disable it and restart your system.
10.
If the system is not accessible, reset the NVRAM_CLR jumper inside your system and restore the
BIOS to the default settings.
11.
Reconnect and turn on each USB device one at a time.
12.
If a USB device causes the same problem, turn off the device, replace the USB cable with a known
good cable, and turn on the device.
Next steps
If all troubleshooting fails, see
Getting Help
.
Related Tasks
Entering System Setup
Troubleshooting a serial I/O device
Steps
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.
Next steps
If the problem persists, see
Getting help
.
Troubleshooting a NIC
Steps
1.
Run the appropriate diagnostic test. See
Using System Diagnostics
for available diagnostic tests.
2.
Reboot the system and check for any system messages pertaining to the NIC controller.
3.
Check the appropriate indicator on the NIC connector:
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