text: when i swich my computer on it goes off after 1 second? i have to unplug it and plug it in several times to get it to work i changed the power lead do when it starts it will work perfectly do you think its a faulty power suply its only 1 month old or some kind of overheat protection if you mean the electric power shutoff after one second,,then the problem is in the power supply unit,, it is not expensive