Windows Vista won't run, computer keeps restarting

I came into my office yesterday, and there was a blank screen with a cursor. I reset the computer and the mobo bios screen came up and then the computer shut down then resarted. It kept this up until I turned it off. I pulled the HD and stuck it in a computer I'm builiding and Vista came right up. I pulled the CPU from the computer and it didn't look bad. I cleaned off the old thermal paste and put a new CPU cooler on there (I thought it was maybe overheating). I restarted it without the HD and the bios screen comes on and stays on. So, I turned it off, reattattached the HD and I am getting the same issues of Vista not coming up and infinite restarts.
Any ideas? Is my CPU wonky? Thanks for the help.
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  1. Hello and welcome to Tom's Hardware Forums. One post will do, by the way. :D

    It might be the chip but if you have more than one RAM stick in there, take one out and if that helps, throw i away. If it makes no difference, put it back and try removing the other one.

  2. Thanks. I'll give that a try. I don't know why the question posted multiple times. I only hit submit once.
  3. Ok, I tried pulling the memory sticks. I have 3. I tried each one, but same thing keeps happening. Is there anything else I should try before buying a new CPU?

  4. It's worth buying a tube of thermal paste - you'll need some for a new chip anyway - and applying that to the CPU, in csae there's life left in it but it's overheating. Was the heatsink fan operating while you carried out your RAM tests?

  5. Yes, the heatsink was running. I had already reapplied thermal paste to the CPU when I put the new heatsink on. The CPU is an AMD 64 X2 5200+, which I've had for a few years now. I think I found another one for around $20, so I'm going to go ahead and give that shot. If it doesn't work, I won't be out much.
  6. Before I bought a new CPU, I thought I would try one more thing. I tried running Ubuntu from the disk drive. It started to work, but it would get to a certain point then the screen would pixel-ate. The mouse would still move and the drive sounded like it was still running, but nothing else would happen. My mobo has onboard graphics; could the onboard graphics have gone bad? Could this be the cause of my problems?

  7. It's a definite possibility but I suggest you try a cheap PCI or AGP graphics card to test the theory before deciding on a more powerful one.

  8. I've got a cheap pci card coming. We'll see if that works.
  9. Installed the video card and that fixed the problem. Thanks for the help.

  10. You're welcome but just remember, you're the one who fixed it. :D

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