Well that tears it. You need to get a new power supply. Get a Seasonic, Corsair or Antec.
This one is a good deal at Newegg http://www.newegg.com/Product/Product.aspx?Item=N82E16817139012
CORSAIR Professional Series HX650 650W ATX12V v2.2 / EPS12V 2.91 SLI Ready 80 PLUS GOLD Certified Modular Active PFC Power Supply for $100.
You can get more wattage but not at that price and efficiency. You can get a Bronze 750W for a little cheaper but I would get that one.