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 have a conflict and wont work together.

If you find this to be the case, contact the manufacturer for assistance.

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.

From the Contents column on the left, under the Hardware header, select USB; the panel to the right will show all the USB devices that the computer recognizes.

It may not identify them correctly by name, but it should have the right number of devices listed.

With each of the following items, check the System Profiler window (press Command-R to refresh the list) to see if the device appears.

If it works there, the issue is with the device to which it had been previously connected.

Sometimes one port on the computer will stop functioning, but others will still work.

Make sure its plugged into a working power outlet (you can test the outlet by plugging in a lamp or clock).

Gasia Usb Kb Pro Drivers For Mac