@vecti73 attach an external monitor to your computer first. What you are describing sounds like a bad LCD at best and worst, a bad GPU based 'nothing frozes at the beggining, after some time white thing spreads on full screen and start frozing image' on this. A bad cable would not care if you just started the computer or not. It would always have the same symptoms. This sounds way different.
Let us know what an external monitor shows you.