Quote Originally Posted by shazza View Post
Sorry to hear this ... first thing I'd check (after unplugging all USB devices) is make sure you don't have something shorting out ... any chance your motherboard screws have come loose (or perhaps too tight)?

Also, is this with the Ultra PSU? Can't imagine that being the issue, as I'd think you'd have other problems if there was a problem with the PSU voltage ... but just thinking (Danger! Danger!) ... USB takes 5 volts, so if the PSU is overshooting on the 5V line, could this lead to the USB over voltage error message? I doubt very much that this would be the case, but sometimes goofy ideas lead to the real solution.
I think I will remove the IO shield and see what happens.