Okay, it's a Gateway 2000 "LP MINI-TOWER" I think... It was working just a couple of mins ago... I just brought it down from my loft, maybe it's like, dusty inside or something... It feels like when I push the on button, there isn't that kind of satisfying "click" when you push it all the way in, it just springs back softly... But I might be wrong. I've checked all the cables and everything...any suggestions?