NO PRESSURE!??!!!!

I have acquired a Silentaire technology “Scorpion I-C” airbrush compressor for christmas. Problem one, I doesn’t want to turn on!, fixed that by twisteing a small nut on the bottom of the filter/regulator. The only problem is that the airpressure gauge only reads zero psi, and nothing is coming out of the airbrush, or even going into the line! Any help would be useful!

That is an auto-shutoff compressor.
If you push the trigger on the airbrush down it should start up.

Mike