I have seen that you guys help out on this forum and decided to join the community and ask for your advice. I am running out of ideas of what to do. I will try to give as much details as I can. I am trying to build a pc from parts that are either new or used and were taken from working systems. The components I started out with was a working P4T motherboard, a working CPU P4 1.0 – 2.0 Unlocked, working two 256 chips and two 512 chips. What happens is that when I plug in the parts the motherboard light is on but the PS fans are off although I hear the capacitors switch on. I have switched the power supply at least 4 times. I have switched the power supply cable 3 times. I tried different outlet, I have switched the P4T motherboard. (In all I have three of them.) In all the cases the light is on but no power to fan or anything else I plugged in to test it. For some strange reason the fans worked before I places the motherboard in the case, after it did not. Also when I took all the power supplies and tried plug in them separately and attaching a fan to them none powered on. So the complete picture is that the motherboards and power supplies worked before the swapping and after only green light is on an all the motherboards tested and all the power supplies fan does not spin when plugged in individually with nothing connected. Any help advice is welcomed and appreciated.