I was having the same issue with mine for a month, tried contacting Dell, nothing. For anyone still having this problem or for anyone who has just started having this problem, here's what I did. I tried an old Xbox 360 trick, I wrapped the laptop in a comforter, making sure to cover any air inlets on the laptop. I pressed power and let it run in the blanket for ten minutes. After that I let it cool, and did it again for fifteen minutes. I let it cool completely, then tried booting it up and it worked! Mine runs without any hiccups now. Also when I did the blanket, I disconnected the laptop's speakers so it wouldn't drive me insane.