Have two GA-965P-DQ6s. One is in an Antec Sonanta II case the other is in an Antec 900 case with an Antec 550w Truepower supply. Both systems have the same components. Corsair CM2X1024-6400C4 memory, EVGA 7900GS video, Seagate 320gb Sata drives. Just built them and neither one will POST. Both do the same thing. Lights on, fans spin a little then shut off, then starts again over and over. I've taken everything out except CPU and the speaker gives a continuous series of shot beeps which the manual says is a power error. I can't believe both power supplies have problems. Does anyone have an idea about this one? Any help much appreciated. One more thing, if I disconnect the additional ATX12V connector the lights stay on and the fans keep spinning but there are no tones. Guess there is no power to the CPU?