Okay, I've gone thru three of the same mobo's. The ASUS Maximus Formula is the mobo. On all three, they go out at the same spot. The pci slot. I run in crossfire two ATI 3870x2's. It is always the same slot that goes out (bottom). I've changed the order of the cards. I've even switched the cards after it goes out to see if it's one of the video cards. Now I get blue screen errors. The pc restarts by it's self. Sometimes I get an error msg in a small windaow, something about abobe and then it closes that page I have open. I really hope this help anyone who can help me.