MSI Big Bang z77 "FF" post code

[Rustproofkitten]

Having some issues with my system as of lately. I've been using the system with no issues until I put in another graphics card. (Two 780's in SLI) and have noticed my computer shutting itself off. I've never seen it happen but several times I've come into my room and seen everything off even though it shouldn't and never did on it's own before. I've tried removing the second card, removing both cards and using integrated graphics, swapping sticks of ram, and made sure all power connections were seated properly. I've tried switching between bios' and clearing c-mos and still nothing. Everything in the computer looks to be working, all fans and leds light up properly. 

 

Specs for my pc are

 

msi Big Bang z77

i5 2500k

mish mash of ram sticks (which is why ram was of the first things I tried but even single dimms won't work)

2x 780's in SLI

256gb Samsung evo

2tb Seagate barracuda

Corair HX850i

6 corsair fans on a custom ek loop

 

[DunePilot]

Occasionally Windows 10 will shut one down after a reset if its a large patch, perhaps your homes power cycled while you were away. You said you aren't present when it has happened so just tossing that out there.