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Did you reinstall Windows each time you got the computer back? If you haven't done so, back everything up and reinstall from scratch. Also, if they didn't upgrade the power supply when they replaced it, that still might be it. You still might not be getting enough power to all your components. Let us know the wattage and brand of the power supply, and any other hardware that's powered by it.
If that turns out OK, I guess I'd look around and see if there's anything in the environment affecting your computer. Then maybe I'd look into the motherboard again.
Do you know why they replaced the hard drive? Was it making odd noises?
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