Hi,i recently bought a gaming pc (gigabyte rx 480 G1 gaming 8gb, i5 6400, h110-s2h, segotep nuclear aircraft 520W 85% 80+) and after 1 min of crysis 3, 5-10 min of gta 5 and others, my computer screen goes black,or gray,or... and i can just restars(if i do it imediatelly after the screen goes...