Hi I have the alienware x51. I was playing rift when all of a sudden my computer shutdown but not like where it closes all the programs shutdown. Like when something get unplugged shutdown. So nothing seemed to be unplugged but when I unplugged and replugged the cable connecting my outlet to the power supply it turned on again. Did it overheat? It just did the same thing today but when I was booting up far cry 3. This time like last time, I forgot to mention that it doesnt allow me to trun it back on until I unplug the power from my outlet and put it back in