Using a known good proc and two sets of RAM, tried multiple PSUs (650w initially, and a 450 spare later)...stumped.
At first, it booted up fine, and I was even able to get into BIOS to set boot priority, launch a win7 install from CD, but it blue-screed at 'starting windows' with a pci.sys error. I tried a couple more times and the same thing, but different BSOD error messages. Figured maybe a bad RAM stick, so swapped ram...same issue. I reset CMOS, same issue. Went down to 2 sticks of RAM, same issue. Put in another 2 sticks of RAM, same issue.
After a couple more reboots, I couldn't get into the BIOS setup anymore. I would see the Gigabyte splash screen, then the code would kinda sit at '52' on the LED readout on the mb, then flash real quick to a couple other numbers, then reboot and go back to C1 and start over. This cycle continued over and over. I started disconnecting everything from the board to try to isolate the issue, but no luck...I had nothing connected to it, even removed the vid card, and same issue. I even took the MB out of the case, insulated it, and tried to boot it from my bench, and still no luck...same issue.
Eventually I decided to re-seat the CPU, and now I get a '00' on the LED screen, then a pretty quick cold reboot. I've been building systems for 20yrs, and I'm completely stumped. I guess I need to RMA this, which is a pisser because I'll be down for weeks. Anyone else have ideas?