I am definitely not confident in all that. It's the fan- sometimes it won't start up, and the reason for that is simple- the fan has cracks all over it, and it needs a push, a literal touch to the fan to start up. It also buzzes like a bee instead of the soft hum of the other fans. What was happening is it would over-heat, crash my system, I'd get a pretty blue-screen when I restarted. After trouble-shooting, I found it was the over-heating of the video card due to no fan being active on the card itself. I flipped the F out.