Dell R300 owner manual If the problem is not resolved, proceed to the next step

Action

1If a single USB device is experiencing a problem, perform the following procedure. For problems with multiple USB devices, skip to step 2.

a Turn off the USB device, disconnect the USB cable from the system briefly, and reconnect the cable.

b Restart the system, enter the System Setup program, and ensure that all USB ports are enabled. See "Using the System Setup Program" on page 46.

cTurn off the USB device and swap the interface cable with a working cable. Turn on the device.

If the problem is resolved, replace the interface cable.

dTurn off the USB device, connect it to another USB connector on the system, and turn on the USB device.

If the USB device functions, the USB connector on the system is likely defective. Otherwise, the USB device is faulty and needs to be replaced. See "Getting Help" on page 165.

2Power down all USB peripheral devices and disconnect all USB devices from the system except the USB mouse and keyboard.

3Restart the system and reconnect the USB devices.

If the problem is resolved, the problem was likely caused by an overcurrent event on one of the USB devices. If the problem persists, attempt to isolate the faulty device by trying different USB configurations.

If the problem is not resolved, proceed to the next step.

4Reset the system BIOS to the default settings by setting the NVRAM _CLR jumper inside your system. Use the following procedure.

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.

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

bOpen the system. See "Opening the System" on page 69.

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Troubleshooting Your System