You're positive that the HDD is dead? Or does it show up as failed in the Intel Matrix boot screen? That has happened to me twice pushing the uncore to x17 but a cmos reset brought it back and has been fine ever since. Your problem looks like a trashed cpu, not motherboard.

1000+ linpack really necessary or were you trying to burn the cpu?
Yes, the hdd is dead. I tested this on another machine and neither works. No, I have not tested for pleasure 1000+ linpacks. Is the number that results from adding three-four hours to find the least stable Vcc, plus three-four hours to find the least stable IOH, etc. Linpack is very quick to find errors in Prime95 stability, but not as fast adjusting stability based on himself.