My rev.a iMac G5 recently started turning its self off. It'll just randomly turn its self off. And then it takes about 3 minutes of toggling the power switch on and off, to make it start up again. When Im trying to get it back on, sometimes when I press the button, the sleep light will blink on (like its supposed to) but it wont stay on (like its supposed to). Other wise I get nothing. Im thinking of hypnosis therapy.