Try memtest86 ( http://www.memtest86.com/
Try removing everything that you don't need. You should be left with:
PSU (presumed good since you swapped it out)
CPU and cooler
RAM (presumed good since running memtest86)
boot hard drive
Disconnect/disable everything else - CD, DVD, USB junk, mouse, network stuff, stuff plugged into the mobo, etc. This'll limit the number of places that the problem could be in. You can even remove the hard drive and substitute a DOS boot disk to see if that makes any difference.
My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able. - John
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