I was trying to mod an mATX powersupply I had laying around, and I unscrewed the ground line that was screwed to its chassis. I forgot to screw it back on before I plugged the PSU back in, and I saw a small spark. It looks like the fuse burnt out, and I was wondering if its possible that I fried the whole PSU, or just the fuse. If I pick up another fuse, do you think the PSU will work again?