CPU: i5-2500k
Motherboard: MSI P67A-G43
RAM: 8GB Gskill 1333
GPU: Zotac GTX 560 1GB
Storage: WD Caviar Black 500GB 7200rpm
Chassis: Corsiar 400r
Cooling: Hyper 212+
PSU: Antec BP550
OS: Windows 7
So I bought an EVGA GTX 770 during their recent sale. Computer is working fine, I take out my old card (listed above) and put the new one in. Press the power button, the computer starts to boot but then shuts down, doesn't POST, then restarts. This continued indefinitely. Switched back to my old GPU, didn't fix anything. I then tried clearing CMOS, didn't work. Removed CMOS battery even longer, then removed one stick of ram. Computer booted fine. Put the second stick back in, boots fine again. I decide to head into my BIOS and look around, but don't change anything and restart the computer. As soon as the windows splash screen appears, the computer blue screens with a STOP 0x7B error code for a split second and restarts the boot process. The Windows repair tool said the root cause is "a patch is preventing the system from starting." I've since tried all of the above steps again, done a system restore, chkdsk, memory test, reset BIOS all with no luck.
Right now, I'm about 80% sure my motherboard is shot, but I really would like to be 100% sure before I get another. The fact that this is all happening right after swapped the cards is very weird. Unfortunately, I don't have another machine to test components on. Any ideas on what this could be?