RE: How to convert an ATX power supply to rc use
I've run into this problem several times with PSUs I've converted for some of my buddies. To expand a little bit on what Andrew is saying, connect the charger AND TURN IT ON before you power up the power supply. That way, the sudden increase in load caused by the charger coming on (usually the capacitors in it) won't cause the power supply to think there is something wrong and shut down. By the way, not all chargers will cause this to happen.