PC restarts automatically!

[TheNaitsyrk]

Hiho,

I encountered this problem few times and the way it works is...

I watch some videos (usually 4K). Then while I watch something, the sound from the video goes "BZZZZZ" for 1 second, screen goes blank and fans in my PC speed up like they would when turning the PC on and the computer is booting to Windows like it restarted itself. Sometimes, it just restarts, not when I watch videos, but exactly same thing happens. Screen goes blank randomly, then fans speed up for a very very brief moment and I can see the mobo logo as if I restarted the PC. Then when I log back in, I can restore tabs in Chrome. No errors are coming up, etc.

Yesterday my Nvidia drivers were crashing on me continuously until I stopped clicking the error message in the right corner where the date and time is. Nothing happened, PC did not restart or anything like that. I thought it's worth mentioning.

I have 4790K OC 1.2V to 4.6Ghz on air (temps are very fine!)
780 TI SLI OC to brim also.

Any ideas what it might be?

 

[Szaki]

If you updated your gpu drivers, they might cause this. The newest nvidia drivers are messing up a lot of pcs right now.

 

[barto]

What power supply do you have? If you don't know, open the case and read the label.

 

[TheNaitsyrk]

1000W Gold power supply Corsair.