I knowit's been a while, but i finally got some free time to do it.
So i bought a cheap heat gun, then baked GPU.
It didn't work. Next day I tried it again, but this time I baked CPU and GPU, and it worked!
So now it turns on just fine but it still has BSOD, so I'm working on that now.
The only problem now is that heat sink gets really hot after a while, and after about an hour image on a screen is all messed up with lines running up and down.