Ah, the QS mobo. It is very fragile. I have broken several. My issue was dropping a screw, yeah a screw, which scratched one of the traces. NP. Number 2 pencil and repaired. It worked fine for a while...but I was doing some serious overclocking with no concern of breakage. It finally died. Tried the pencil again and no go. So, with that, scan over the traces just in case...mostly in the large empty part of the mobo.

-maestro