I have an older UPS that I like a lot, but as I was changing the batteries in it a while back, I accidentally touched the shell of the case with one of the battery leads. Now it won't turn on at all.

Can someone give me some pointers as to how I might repair it, or go about finding what compnent is shot?

I can post pictures of the circuit board, if that would help anyone (although not right now).

Thanks.