tpu switch ? Have you tried it with the switch off ? Seems folks have troubles with the auto overclocking stuff, high temps causing crashes maybe.
Here's some links -> https://www.google.com/#q=asus+p8z77+v+pro+motherboard+tpu+switch
How did the thermal paste look when you assembled the CPU heat sink?
So i was going to the store and decided to leave my PC on, i was gone for about and hour and when i came back it had frozen. so i pushed the powerbutton to turn it of, and then turned it on again. so it started up normally and i typed in my password, but right when my desktop came up it froze, everything froze, the screen just stayed as a still image, and neither mouse or keyboard did anything. I tried to restart it but the same thing happed.
it doesn't freeze if i start it in safe mode, or safe mode with networking, but if i open my browser in safe mode with networking it freezes in the same way after about 10s.
It's a custom buidt gaming PC, but my friend helped me a lot with it so i don't know all that much about it and I don't know what to write when writing my specs but..
ASUS P8z77-v pro motherboard
ASUS GeForce GTX 680
8 gigabytes of ram, DDR3 Kingston
( I dont know if this is at all relevant..)