Nail gun not shoots

There should be a spring to return the driver. The mechanism needs oiling with pneumatic tool oil before every use. If it's not been oiled, it will stick.

Again sounds like blown O ring give it a squirt of 3in1 oil and fire it several times (if oil is compatible in your gun). Repair center if that doesn't work. Trash can also get in the air orifice and stop moving parts from moving.

check that 2 are not jammed together/and safty is able to be pushed

A nail gun works on compressed air.
When you hook the air hose to the gun it fills a cylinder with air pressure.
When you pull the trigger. the cylinder pressure is released onto a firing pin that shoots the nail.
The air pressure line is also connected to the trigger and therefore the trigger has to be sealed.

When ever using a nail gun, you add a bit of gun oil in the back of the gun (not 3-in-1motor oil, it has to be non-detergent gun oil)

If you haven't used the gun in a while, it is best to oil up the gun and let the oil run down into the gun.
If you use anything but gun oil, the seals will give out.

Your trigger seal has given out. It is probably an 'O' ring. You can access it by taking it apart. Look for the O ring.
Bostich makes re-build kits for the different guns that you can buy on-line.
Back when I was in construction, there were several nail gun shops that sold and serviced nail guns, and sold nails to the contractors. I don't know if that business model is still active or if you have to send the guns to Bostich service center.

check with one of your friends that have a nowinly good 18v bat if that dont work check for little pieces of plastic or pieces of the nail that are jamed up by the plunger

You have to oil the nailer with pneumatic oil, or you're using the wrong size nail

have you activated the fuel cell by pressing the black nozzle down onto the cylinder?

I had the same problem with my Stanley stape gun. Had to replace all the seals and piston. Works find now! Check-out internet ...search for a rebuild kit for your model of gun. Get the complete rebuilding kit ....take about 1/2 hour to rebuild.

Not sure exactly what Bostitch framer model you have, but if it is powered by compressed air, as long as you remove the air hose from the nail gun, there should be no risk of the nail gun firing while you remove the jammed nail. There should be a way to access the driver area from the top of the nail gun, even via a latch or a couple screws. Remove the top part of the driver area and that should give you access to the jammed nail, which you can remove. Use long nose pliers or something similar if the nails are really stuck.