The early 2008 MBPs sport the flawed 8600M GT GPU. Have you had the chance to hook up an external monitor to see what happens? It sounds like your MBP is booting, but you just don't have any video. This is one of the symptoms of a failed 8600M GPU. If this is indeed the case, you are covered by an extended warranty program. Before you scrap it, wait until you get back to school and have them take a look at it -- you may not have to pay anything.