I built a new computer 2 weeks ago (new motherobard, CPU, Memory, Video Card, Case). Everything worked great for the first day. I laid the desktop on its side to remove the feet of the case so it would fit into my desk. When I went to turn the computer back on it refused to power on. I took it to a local computer shop and they quickly identified the problem as a dead power supply. They put in a nice new 650w power supply and they hooked it up at the shop to a LCD, Keyboard and Mouse and everything worked fine. I took it home last night and again everything worked fine. Since it was in the shop for a week there were some new AVG virus definitions and Microsoft updates that it wanted to download which I did. After restarting the computer because of the updates, within about 5 minutes the computer rebooted automatically and it wouldn't get past the BIOS. I restarted the computer several times and it wouldn't get past the BIOS. I couldn't even hit the "Del" key on the keyboard to go into the BIOS, it just seems frozen. I tried hooking up a wired keyboard and it still wouldn't let me get into the BIOS and it still wouldn't load (I have a MS keyboard/mouse). I went to get some dinner and came back to the computer and when I turned it on it loaded just fine. Within about 5-10 minutes I would get a blue screen of death telling me that there was an error with system32.sys or something like that (not sure...didn't write it down). Then after it errors out it won't get past the BIOS. After you let it sit you can get into the BIOS and it is seeing all of my drives, the CPU, memory and then it loads windows just fine (for about 5 mins) and then restarts automatically. I enabled the memory check within the BIOS and it checked out just fine. So after a long night of trying to figure out what was causing it I turned it on this morning after being off all night. I turned it on and within about 5 minutes it didn't blue screen, it just restarted and wouldn't get past the BIOS.
So I took it to the same computer shop today to ask their help and they said it was OS related and when we booted it up at the shop it never restarted on its own (after about 10 minutes) and of course everything worked just fine. He said my registry might be corrupt or that my mouse/keyboard might be faulty even though I tried 2 keyboards (one wired and one wireless). In the shop he also noticed that the hard drive kept spinning (even after 10 minutes) when we weren't doing anything requiring retrieving any files which puzzled him and he said I should do a XP repair. I am going to of course take it back home tonight to see what it does and only hook up VGA, keyboard and mouse and see if I am still having problems. I haven't yet tried booting into Safe mode to see if I still have an issue but what puzzles me is why I can't get past the BIOS after it restarts itself and I can't even get into the BIOS until I let it sit turned off. The BIOS isn't giving me any error codes other than just a single normal short beep that I have always heard when it first powers on after about 10 seconds. The case has a hard drive and CPU temperature reading which the computer store setup which is ready 34/35c for the CPU and 31 for the hard drive and the computer shop said it is definitely running cool and isn't over heating. The computer shop is saying that the hardware seems fine but I wanted to get a second oppinion.
Does anyone have any advice or can you advise on how I can further troubleshoot this? Thank you!