Have tried to plug your power supply to a wall outlet with an extension cord?
Does it work?
On your PSU, there is a label with specifications. What does it say about the current consumption on 120Volts?
I imagine that your inverter is rated at 400 Watts peaks, if that is the case and your psu runs well on an extension cord connected to a wall outlet, I would suspect that your inverter is not powerful enough or not getting enough power to energize your PSU. What type of Wires did you use to wire your inverter to your car's 12 volts system and how long are the wires?
Assuming that your inverter is 100% efficient (None of them are that efficient) it requires 29Amps at 13.8 Volts to generate 400 Watts. Add the power losses in the conversion and you can easily require over 40 Amps for the inverter to run.
Originally Posted by Samirnoff!