How can I keep my cats from chewing up all the wires behind the computer!

I’m trying to be patient but my two cats are driving me up the wall. They have managed to chew up every wire and cord behind the computer. The main computer cord, the digital camera cord, the iPod sync cord, the telephone cord, the speakers and amplifier cords, etc.. all chewed to pieces. I need some kind of repellent or some covers to put over the cords and mount them to the wall above the floor so they can’t get to the wires. Any advice from fellow cat lovers?