Man I don't know what's going on...that thing was a damn good motherboard since I first got it...
The whole thing about the CPU fan at 0RPMs worries me. I don't know if oyu realized this, but the computer will cut off if the fan goes to 0RPMs.
With the networking part, I'd try swapping PCI slots if possible. Sometimes that helps out if there's some minor hardware conflict or anything.
Um...hmm... I can't think of much else to try. Perhaps to be sure this isn't some heat issue or anything, you could try underclocking the processor?
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Primary- i7 920 | 6GB RAM | 9800GT | 160+160+500GB
Secondary- Athlon X2 4200 | 2GB RAM | 7600GT | 80+250GB
Netbook - Atom N280 | 2GB RAM | GMA945| 160GB
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