BIG PROBLEM with my Toshiba Satellite P205-S6337

I just got this computer in June 2007 but didn't have money for an extended warranty. Of course the inevitable happened and now I'm having problems... All of a sudden, whenever I leave my computer open for more than 15 minutes with inactivity, it will go into standby. When I touch the fingerpad or a key, it comes up for a second, then goes straight to blue screen. Then, it restarts into the Command prompt. I usually click "start windows normally". BUT when I was out of town last week, the computer would automatically upon startup go to the blue screen. I was also unable to get wifi connection without it going to the blue screen then shutting down repeatedly. The only way the internet would work would be after about 6 shutdowns and blue screen, and me saving the connection to start automatically, but only in the "start windows in safe mode with networking" from the command prompt screen. I also tried using a LAN Cable, with the same effect the second I stuck that cable in, it shut down my computer. Please help me out here. I don't know what to do!