I just put together my own computer and it was working fine till all the sudden i noticed it started to just stop and the computer would lock up. so i restarted thinking that would fix the problem and it happened again. at first i thought it was a heat problem then i cooled it down and tryed it again and that didn't help and i noticed later on that it was only in dark places in games that it had blue squares everywhere and that problem continued and i was puzzeled and i don't have a clue why blue square/dots and locking up of my computer is happeneing? anyone got any idea as to what is going on???