I have just built a new system but have a problem. When i switch on the power - it powers up , fan case spins, and cpu fan kicks in after 1 second but then it all switches off again after 3/4 seconds. Then it starts up again and repeats the process again and switches off again. constant cycle. I have connect speaker and hear no system beeps to indicate a component fault. I have removed all components and just had mboard and cpu/cpu fan plugged in and i get the same problem so it can be any of the memory/ hdisk. I have checked that cpu fan power is installed correctly, and both atx and atx12v(4pins) power is securely connected to the mother board. Any help / advice. I have tried everything. My spec is below gigabyte ga965pds4 intel due core 2.13ghz dabsvalue case : quicklinx: 3V33WS mfr#: 8032-C4 corsair 2x512mb memory 160gb sata2 w.digital hdd.