Black screen yesterday, WTF?

My current rig is below in my signature FYI. So normally I leave my system running 24/7, its what I've always done. I don't even put it to sleep, only the monitor shuts off, the system is always running. However, when I go away for business, which I do occasionally, I will shut it down. That's what I did Saturday morning when I left for a short trip, it was a normal shutdown with no issues. I've had no problems with my computer in the year its been running.

So when I got back yesterday...

Black screen yesterday, WTF?