DELL HR675 User Manual

136

Troubleshooting Your System

3 Swap the faulty keyboard or mouse with a working keyboard or mouse.

If the problem is resolved, replace the faulty keyboard or mouse. 

4 If other USB devices are connected to the system ports adjacent to those 

used by the keyboard and mouse, power down the devices and disconnect 
them from the system.

An overcurrent event on another USB device can cause both the keyboard 
and mouse to stop functioning.

If the mouse and keyboard do not immediately return to operation after 
disconnecting the other USB devices, restart your system. If the problem 
persists, proceed to the next step.

If the mouse and keyboard operations are restored, reconnect the 
disconnected USB devices and power them on one at a time. Note if any 
device causes the same problem and replace any faulty device(s).

5 If you have remote access to your system, use a remote host to access the 

system’s System Setup program and enable the USB ports. If remote 
access is not available, proceed to the next step.

If enabling the USB ports does not resolve the problem, see "Getting Help" 
on page 175.

6 If you do not have remote access to your system, use the following 

procedure to set the NVRAM_CLR jumper inside your system and restore 
the BIOS to its default settings.

 

CAUTION: 

Only trained service technicians are authorized to remove the system 

cover and access any of the components inside the system. Before performing any 
procedure, see your Product Information Guide for complete information about 
safety precautions, working inside the computer and protecting against 
electrostatic discharge.

a

Turn off the system and attached peripherals and unplug the system 
from the power source. 

b

c

Locate the NVRAM_CLR jumper on your system board (see 
Figure 6-1) and set the jumper to the enabled position.

d