I was having problem of monitor losing signal along with scratching sound from case while playing games which turned to be problem of faulty GPU which I replaced with GTX 970 and it was alright for maybe one month until it started happening again. Problem occurs either after 10 minutes of playing or 10 hours so it's pretty random.
I can even identify failing drivers from BSOD reports but it is ussualy always different driver ie. dxgkrnl.sys, USBD.SYS, watchdog.sys, Beep.SYS, etc.
My worst suspect is probably faulty PSU but would really welcome any advice from experienced people.
So far my computer is few years old but monitor losing signal is quite new issue. To summarize some specs I'm running 8GB RAM, GTX 970 4GB GPU, 3.4GHz 64bit CPU and Corsair TX850W PSU. I could specify it more if needed but looking mainly for general cause for this error and possibility of faulty PSU as was already suggested to me. And of course all drivers including BIOS and Nvidia are up to date.
I am kinda desperate now as it lasts for really long time and I've already bought new GPU so please someone help me.