So I was doing a power supply change to my PC due to the old one being loud and old, but during the process I must have done something wrong because now the computer does not turn on at all. The fans ramp up for half a second before they stop and the power button led doesnt even turn on. If you try to turn it on again, nothing happens this time, not even the fans spin for half a second anymore. What did I do? Is there a way to fix it?