Ok, worst case scenario is that it may have shorted a portion of the motherboard out. If that is the case and it does boot up after, you aren't completely out of the ballpark as the short COULD, i'm not saying it will, it could cause further damage down the line to other components. Don't feel bad man, everyone who builds has probably done it once or twice, me included. (glad it was an old computer we no longer needed that I did it to)