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I'm getting very annoyed and I am about to buy a brand new airbrush because this is pissing me off so much. I have a double action airbrush hooked up to an air compressor. For a while, it was working great then one day, I forgot to clean the air bush (can't remember why) and left it. About a year later, I tried airbrushing but no paint came out. Tossed it into an ultrasonic cleaner with simple green for an hour, put everything back together and still no paint is coming out. Should I maybe toss the airbrush (taken apart) into some straight paint thinner for a day or two then try again?

Yep, paint thinner is probably your only solution.

I'd agree, if you're to the point of throwing it away, may as well get aggressive with it first.

Acetone would be another option

Is air coming out of it at all?

Sometimes you need to take the whole thing apart to figure out whats wrong with it.

Also, I don't think 1 hour in SG is enough.

 Thairne wrote:
Also, I don't think 1 hour in SG is enough.

This. I've never understood how people expect results with an hour in a bath.

I've had stuff in it for several days and still didn't get great results. Then ignored the bath for months, came back and stuff would wash clean just from running it under the water stream, and be nicely polished with a brush.

OP you're being impatient, I know you want to get into it now while you're enthusiastic but it's just a simple steel airbrush - take the time to nuke the grime inside it, and I'm sure it'll be okay. Don't waste money because you don't want to wait.

This might help:

Will water come out of it (instead of paint)? Can you see light through the nozzle tip when you disassemble it and hold it to the light?

The nozzle could be gunked up and needs to be scraped out.

Make sure also the needle is moving back when you hold the trigger and pull.

Airbrushes are not hard to troubleshoot: It's either the paint or air, and once you isolate it, the only thing you need to do is clear the passageway.

Talys's advice I second.
Take it apart, if you put water in the cup, does any come out?

Is the needle moving freely?
The needle seal is not gunked up?
If the needle moves freely there may be paint hardened around it near where it seals (fluid nozzle) and may need to be dissolved / chipped out.
Having a nozzle "file" would help with the cleaning:

Talizvar, that is a cool, simple diagram that everyone with an airbrush should understand.

The only thing it doesn't point out is the nozzle, aircap, and crown that most air brushes have in some combination.