This will not be an issue with your inverter.
Power Good is a 3.3v signal that get's sent through pin 8 of an ATX connector, or a 5v signal that is sent through pin 1 on an AT connector. The purpose is to give the motherboard a signal after the power suppply has stabilized and is able to output enough power properly.
Some motherboards will not boot without it. However, using an inverter will not change this event if your power supply works with the motherboard already.
[ 10-22-2001: Message edited by: milesg ]