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I am currently having the exact same problem. I have a Intel Celeron 2.8GHz. Recently the computer has started to reset it's self just after I login into windows. On a few occasions I have then been met with the message "CPU prevously shut down due to a thermal event (overheating)". When I finally get into windows (just long enough to check my email) my flat panel mnitor flickers, then the computer resets. I would be very grateful if anyone knows what might be the problem!

Is the cpu fan running?
We can fix this, but you're gonna need a butter knife, a roll of duct tape, and a car battery

If fans etc. are all ok. See if needs a bit of a clean, heatsinks fans etc. use a can of air and a soft small brush, see if that makes a difference. Make sure air flow is not restricted.
AMD64Bit 3800+ Socket 939
WinXP Pro.
Nvidia:6800GT
Dane Electronic Pro. Dual 1024MB 400MHz RAM
Tagan 480Watt PSU: 28Amps on +12volt rail.
Asus A8V Deluxe "WiFi" M/Board -
AquaGate

It is also recommended to re-apply
thermal paste at every 1 1/2 year. remove
your heatsink and clean the old thermal
compound with alchool. Apply a thin layer
of thermal paste and reinstall your
heatsink. It should solve the problem.AMD 64 3200+ 754
Abit KV8 Pro
1go DDR 400 Kingston
FX5700LE
160 gb SATA Maxtor
80 gb WD

"It is also recommended to re-apply
thermal paste at every 1 1/2 year"I don't agree with that statement at all.
Asus A7N8X-X
1800+ @ 8 x 210MHz
512MB PC3200
Asus Ti4800SE 128MB
WinME/WinXP Pro

I agree with Jam,unless absolutely neccessary (as in fan failure) certain socket types even with zero insertion force, are not designed for high pressures needed to reinsert.
If you have a micro tower, I have heard that the the densely packed nature of the case geometry causes overheating.
Most likely cause is restricted cooling and airflow or CPU fan failure,my first guess.

Check to see if someone has lowered the shutdown temp for your system in bios. The cpu has alot of work to do during boot up, so it gets up to temp pretty fast.
Open the side of your computer, and as you boot it, see if any of the fans aren't spinning. Try blowing a fan onto your mobo to see if it helps.

Check the capacitors on your motherboard near the power suppy and make sure they're not bloated or leaking.

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