166 Troubleshooting Your SystemAction1 If a single USB device is experiencing a problem, perform the followingprocedure. For problems with multiple USB devices, skip to step 2.a Turn off the USB device, disconnect the USB cable from the systembriefly, and reconnect the cable.b Restart the system, enter the System Setup program, and ensure thatall USB ports are enabled (see "Entering the System Setup Program"on page 43).c Turn off the USB device and swap the interface cable with a workingcable. Turn on the device.If the problem is resolved, replace the interface cable.d Turn off the USB device, connect it to another USB connector on thesystem, and turn on the USB device.If the USB device functions, the USB connector on the system is likelydefective. Otherwise, the USB device is faulty and needs to bereplaced (see "Getting Help" on page 205).2 Power off all USB peripheral devices and disconnect all USB devices fromthe system except the USB mouse and keyboard.3 Restart the system and reconnect the USB devices.If the problem is resolved, the problem was likely caused by an overcurrentevent on one of the USB devices. If the problem persists, attempt to isolatethe faulty device by trying different USB configurations.If the problem is not resolved, proceed to the next step.4 Reset the system BIOS to the default settings by setting theNVRAM_CLR jumper inside your system. Use the following procedure.CAUTION: Only trained service technicians are authorized to remove the systemcover and access any of the components inside the system. Before performing anyprocedure, see your Product Information Guide for complete information aboutsafety precautions, working inside the system and protecting against electrostaticdischarge.a Turn off the system and attached peripherals and unplug the systemfrom the power source.b Open the system. See "Opening the System" on page 68.
