It just shuts off, but the computer appears to be on. (My screen will turn black, but the computer itself looks like it is still running, so I just hold the power button to shut it off)
I take it if you try hitting Num Lock or Caps Lock, it doesn't toggle said lock? And what games are giving you trouble? And is it always these games?
The temperatures check out though. The GPU is toasty, but it can survive another 20 or so degrees before it overheats. Usually when something overheats though, the part tries to clock itself down. GPUs in particular will start giving off graphical glitches.
Another thing that may be happening is when you quite a game from full screen, your GPU doesn't seem to sync up properly with the monitor. So the monitor thinks it lost its signal. Power cycling the monitor usually fixes it.
Using my num/caps lock will toggle my keyboard settings, this CPU monitor setting is just my normal temperature. My computer is in my basement, and its not too cold here (although it is left here overnight, there is heating near it.)
Maybe it is my power supply or graphics card. I think I will try to swap them out (my pc is 300 watts if I remember) I'm going to possibly switch it out for a 500 watt, with another new graphics card in place. I cleaned out my fan but that didn't seem to fixit, so I think the game is causing too much tension on my card? This happens with games like TERA, Ghost Recon Online, Path of Exile and that's about it (I don't have an extremely large library of games.) It closes after a while of play on those games. It doesn't close when I play League of Legends, Garry's Mod, or even on Dungeon Defender.
I am positive my card is updated properly. I will try to update it again (I'm using the Nvidia Experience to update)
EDIT: Checked Nvidia site. Driver is newly up to date as of today.