On second thought...after reading the MS KB article...your CPU is likely ok. Most likely cause could be a RAM problem. Good info in that MS link. Check it out.
in reply to the second posting - thx - will check it out - but I don't hear the case fan running nor do I remember hearing it for some time - I feel pretty sure that may be the problem.
Sam got it.
The fan makes sound and blows air, so that you can sense.
Open the bottom and wiggle all the memory to reseat all the contacts. while you're in there, look for little can shaped onjects(capacitors). they'll be around the CPU and memory area. See if any are bulging. If they are the motherboard needs a good tech, or replacement. Test.
If that don't work. Take it all out and put the minimum required mem in and retest.
If that don't work. Take that out and exchange for what was left out.
If you only have min memory in one, or 2 sticks, you may want to take it to a tech and have them test the board. they'll have good mem to test with.