at certain times, when i open a game, like roblox, my pc screen goes black, pc is still on but i cant see any video, so boom i hold down the power button, and turn it off then turn it on again, and then i see my lock screen, i press space to go and log in, and then it goes black again, this doesnt always happen its just random, but it happens ALOT, ive had this computer for about 2 years or so, it didnt happen when i bought it and used it for a long time, it started happening like a year ago or so, ive been suffering with thi piece of garbage ever since. please help me, ive tried using different drivers, different cables, and everything. just doesnt do anything.