I've got a hitachi 2nd fix nail gun and for some

Have you disconnected it from the air source and deep cleaned the nail gun? Sometimes even a tiny bit of dirt can block the rails the rod runs in. Once cleaned add a small amount of oil to the rod runners.

The reason the light isn't green is because your battery is not fully charged - if you have charged it, the battery may be at the end of its life.
The reason it is not firing unless you depress the nose several times is because your fuel cell is spent - check the expiration date on the bottom of the fuel cell.

Did you take the nails out a check the safety , where the nail comes out ? Sounds like a stick or stuck safety switch . Good Luck !!!!!!!!

Have all the nails been cleared out of the tool where they were jammed? If not take the fuel cell out of the tool, and remove the battery before working on it. If still persists come back to this website for further help.

If every nail is stopping at the exact same height, a likely reason is the tip of the driver is broken off so it's not long enought to drive the nails all the way to flush. If the height of the nails is slightly different you may have worn or broken o-ring(s) inside the gun and air is leaking around the driver's piston or elsewhere in the gun so that the driver isn't getting full pressure. You can take the gun apart and inspect the o-rings. If you push the driver all the way down the tip should come flush or slightly past the end of the nose piece (not the safety tip). Parts are easy to find online or at a service center if you have one nearby.

Any time these guns become intermittent or stop firing but the fan still runs, the first the to check is the expiration date on the gas cartridges. The do expire and this will make the gun work inconsistently or not at all.

Start with the basics:
First check that the butane (or whatever gas is used) canister is full. If empty, put in a new one.

Second check to make sure your battery is fully charged to be able to fire the spark to work the nail gun. If not get the battery charged and/or replaced as needed.

Third make sure all of the safeties are working properly and that you have them engaged to the piece of wood you are nailing when you try the trigger.

If beyond that it does not work it could be a bad trigger, a bad safety switch, or even a bad connection from the battery to the device.

Does the fan run and the light blink ont he nailer? I have one that I just bought. I put in the wrong type of nails and got one stuck. I had to take the front apart to clear it and now the damm thing wont fire. The green light blinks and the gas cartridge is basically full, even the fan does run after I release the push lever, but no fire???

I wonder if yours is the same as mine did fire for a couple nails first just fine then got jammed...

I will try to charge the battery more.... MAybe like yours it needs a strong charge for the spark...
Russ