It started few month ago, PC does this very few times, today it did again, started searching on internet, like few month back, i get same answers ! Its GPU problem ! But i dont thinks so, i was looking around in BIOS, ( i have Gigabye Z390 Gaming motherboard) i went to Smart Fan 5 in Bios, there was CPU fan and when i chnage speed to full speed, it did it same, first goes CPU fan full speed, then other fans and then goes secreeen balck and need hard reset, i try it again and same result ! I dont understand whats wrong ???