Some one please help me with this Hello, I have a really old PC AT power supply which does not have a hard power on/off switch, It is an old supply with PS1 and PS2 connectors. I want to use this supply as a secondary supply for my system to power up some fans and extra stuff but I don't know where or how to start with. The system with which I want to use this supply is an ATX power supply system. Whenever I connect this AT supply with 220v power cable it does not power on (The fan does not move). I have also tried connecting dummy loads like two old hard drives but it does not power on. The PSU is not faulty but it is not power on even with load. Tell me what should I do ?