|I do abit of work on the side fixing computers for friends and family. Got this computer from a friend. As soon as I plug the power cable into the PSU, it turns itself on and then off after 3 seconds and loops forever.|
So far I've tested another PSU, does the same thing. I've unplugged all cables to the motherboard except 24pin and 6pin power cables., no devices are plugged into the motherboard either at the back of the computer.
Could a short be causing this on motherboard how do I test.
While i'm waiting for an answer, I've removed the cmos battery, gonna leave it out for about an hour before putting back in.