If you've updated your software and checked the drivers but the issue still persists, try the following things:
Unplug the affected device from the USB port and then plug it back in. Make sure that the connection is secure. Note that USB plugs fit into ports one way only—if you try to plug them in upside-down, you won't have any success.
For troubleshooting purposes, unplug all USB accessories from the computer. Then start plugging in USB devices one at a time, testing each one to make sure they all work before adding the next. Sometimes two devices will conflict and won't work together. If you find this to be the case, contact the manufacturer for assistance.
Ask yourself, is this a new device that never worked, or is it a device that you've had for a while that suddenly stopped working? If it used to work, think about what changed just before the device stopped working. Did you recently add another new device? Install a new program? Try reverting the computer to the way it was before the device stopped working. If it works again, there is an incompatibility with the device and whatever you added. (See the section on troubleshooting device compatibility below.)
