By no means, am I saying ForBruce is wrong, power surges play havoc on anything electronic!
but, you have an IQ system... is there any way you can get your cart to a CC dealer, and have them check it with a diagnostic tester?
It could be just an "error code" that may be locking things up.
I don't see any harm in getting it checked out first... It could just save you a couple of bucks!