Hi all, we have a very frustrating random shutdown problem. My brother's computer would randomly shut down, regardless of whether he's playing games or leaving the computer idle. so it seems it's not a software problem. Funny thing is it would shut down, but the green led light still blinks, and in order to turn it off completely he has to unplug the power cord and depress the power switch until the light goes off. He suspected the power supply at first, so we got RMA replacement, and it happened again. Then we tried a different brand of power supply (thermaltake) and it still happened. so i took the computer to a computer repair shot, and the technician just tested the power supply, found it was defective, and sent me home. Well, I ordered yet another brand of power supply, and the problem's not going away! My brother has also run memtest, reinstalled windows (after formatting the HD), and tweaked several power management settings. Still no clue with what's wrong with the computer. Please help!!!