i have an Antec 500 watt ATX 12V v2.2 ive already had one go bad on me before. when i turn the power on on the back of the pc i can see that theres a light on the mobo that turns on. When powering it on fully from the front my fans will turn on briefly and a second light on the mobo which indicates that the pc has been powered to boot flashes on for a sec and then everything shuts off. After this happens i still have the one power indicator light that is still on. what should i do to trouble shoot this? i have a second pc with identical parts, so substituting any parts will be no prob.