Macbook keeps shutting itself off after upgrading to snow leopard

Hi everyone, I hope you can help me out as I am out of ideas! After be assured that I could upgrade my late 2006 intel based macbook (10.5.8) to snow leopard, I bought the disc and tried to install. Everytime I tried, it shut itself down. I wiped the hard drive clean and tried again. Still happened. Finally after 14 hours of attempts, something finally stuck and I had snow leopard. I then tried to get all the updates and it kept shutting down. I tried to migrate my files from time machine and it shut itself down. Fed up, I tried to go back to leopard, but the computer won't stay on long enough to complete this. I wiped the hard drive clean again and now it won't stay on long enough to get to the start up page! HELP! I tried starting up in safe mode and it won't work. I've run disc utility several times and it says everything is OK. Now I have a blank hard drive on a computer that won't stay on for more than 5 minutes. Any insight would be greatly appreciated, otherwise I got to take it in to an apple specialist as the apple store has already told me the refuse to work on it because it is older than 5 years!!!!

Try a PRAM reset
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound two more times.
Release the keys.

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+At 01/02/2010 12:21 AM we wrote -+
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John L.
Thanks,
John

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Pahu

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