Hey everyone does anyone know of any good or excellent free diagnostic tools out there to stress a computer. I seem to be getting random lockups on a game I am running. The game has been running fine for a year and a half now all of a suden I get random lockups. New video card. (yes it was locking up with the old video card) Yeah I have done all the things like check the drivers and whatnot. Yeah I have reseated cards and checked to see if things are plugged in.