When I launch Far Cry 4, I see the fancy splash screens for a few seconds, then MSI afterburner says my GPU goes to 100% and my FPS goes up to ~3500, GPU memory usage skyrockets, and then my entire PC shuts off. The strange thing is that this all happens during the splash screens before I even get to the main menu. All my other games work just fine on ultra settings. I ran stress tests on CPU, GPU, and memory and everything was fine.

My PC specs are:

i5-4670k (overclocked to 4.3 GHz)
8gb DDR3-1600 Crucial Ballistix
GIGABYTE GeForce GTX 970 G1 Gaming (stock speeds)
EVGA NEX750B 750 watt power supply
MSI Z87-G45 Motherboard