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Hopefully this helps someone with this problem..

For months.. at random, my computer would run and then the screen would go black requireing a restart. this happend randomly and sometimes it would happen 10 times in a row after each restart. Sometimes computer would
work fine for hours or even days without the problem.

some of the time, the computer made an odd screeching noise from the internal speaker.. sometimes not.

Checked everything and replaced nearly everything.. heat.. IRQ's.. graphics card and drivers... nothing worked untill i noticed that the network card would flash at exactly the time the computer screen went down.

turns out my linksys network card was burning up or just heading to the grave. replaced it and never had the issue again.

your network lights should always be on if they have them on your network card while connected. if you experience this same similar problem, take a peek and see if your card lights are still on.. if they are off.. pull the card
and restart.. betcha wont have the problem anymore.. a cheap fix as well!

I was about to replace the motherboard untill i accidentally made this connection.. glad i did.. hope this helps someone else!!!

I had the same problem and the solution rikb99 suggested nailed it. Thanks for sharing!