Dell POWEREDGE C6105 - Manual (Page 186)

186 | Troubleshooting Your System
Jumper Settings" on page 212 for instructions on setting the
NVRAM_CLR jumper inside your system and restoring the BIOS to
the default settings.
6 Reconnect and power on each USB device one at a time.
7 If a device causes the same problem, power down the device, replace
the USB cable, and power up the device.
If the problem persists, replace the device.
If all troubleshooting fails, see "Getting Help" on page 215.
Troubleshooting a 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 another working cable, and turn on
the system and the serial device.
If the problem is resolved, replace the interface 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 problem is resolved, replace the serial device.
If the problem persists, see "Getting Help" on page 215.
Troubleshooting a NIC
1 Restart the system and check for any system messages pertaining to the
NIC controller.
2 Check the appropriate indicator on the NIC connector. See "NIC
Indicators (BMC Management Port)" on page 21.
 If the link indicator does not light, check all cable connections.
 If the activity indicator does not light, the network driver files
might be damaged or missing.