What do you do when your PC shuts down all of a sudden? Do you check your power connections and cables? Do you test the power supply? Do you check for overheating? What if all of the above checks out fine?
A couple of weeks ago I have ran into a very unusual problem with a Gigabyte G41 with DDR3 motherboard. It was only 2 months old, and when it got to a certain temperature (around 40 degrees C) - the PC would shut down. It was very hard to detect because if the room was air conditioned and wouldn't let the board warm up to this temperature - the machine would run for hours and hours.
Replacing the mobo did the trick.
So if you get a machine that shuts down abnormally after an hour or so, and all usually responsible components check out fine - it may very well be the mobo.
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