First, welcome to the Forum.
Second, can you swap any parts between your 2 rigs? FYI, I never had a CPU die in any of my rigs. I'm thinking either the board, or the PSU.
Also, you can follow the steps shown in this post:
http://www.hardwarecanucks.com/forum...ery-guide.html.
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Main: GA-X58-Extreme - i7 920 - TX750W - Raptor - 3Gb DDR3-1333 Triple-Channel - GTX260 SLI'ed - TRUE - P182
HTPC: M3A78-EM - 5000+ X2 - HX520W - 'cuda 1Tb - XP2-5300 2x512Mb - 9800GT - SI-128 - Prelude - Moneual 932B