ATX Power Connector is bent

Are the metal pins inside the plastic connector bent or is it the plastic connector?

ATX motherboard connectors would be pretty hard to 'bend', if you mean that the snap-on ATX connector is not lining up, you can probably fix that by going in with both hands so you can hold both parts of the connector together and make it line up.

Worst case, the extra four pins are optional on most motherboards so you can simply snap it off and go with only the 20pins part.