PC goes to black screen and fans get louder

[andre.bombino]

My PC goes to black screen roughly every 20 minutes, where nothing except sound works (monitors lose signal, keyboard and mouse don't work). GPU temps are ~70 and CPU temps are normal as well. Sometimes the fans get pretty loud, but this doesn't happen every time. I don't even have to be playing anything, just being on Discord or watching YouTube is enough.

I have an nVidia GTX 780, i5 4670k @ 3.40GHz and 8GB of RAM. I have reinstalled Windows but that didn't help. I think either the PSU (Fractal Design 650W, can't remember the name) or motherboard isn't working properly. What I've tried to do is use different power usage settings (high perf, balanced) but nothing's changed.

 

[Gorrak]

If you have not tried yet give your computer a good clean. Compressed air.