Well, I'm a little late (kind of an understatement), but I had about the exact same problem...only I was building my comp; I took some of the METAL scerews and screwed the mobo to the case. When I turned it on, all I got was this little green light on the actual mobo showing that it's on or something...I followed the exact instructions from my mobo manual, but I also looked at "Building a PC for Dummies", where it said that you mounted it with these plastic mounting screws. I felt sooooooooo stupid after I installed the plastic screws...cause it worked after that. It could be a suggestion, but I highly doubt you or anyon else for that matter, is that idiotic. =p If not, then, yea, what killians45 said...dead mobo; buy a new one.