Its a 500b evga, i have plugged all front panel connectors in, if i unplug it and slot it back in one of my coloured fans flashes for a second. Its the 24 pin connector. Nothing happens, i have checked it is in right. I have tried it with another psu and it turns on with that one. Its just this ones newer than the other. Ive never had problems before i was just doing cable management