Stapler won't stops stapling

Nearly always caused by a jammed staple at the hammer head at the end of the staple magazine.

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When you lift up the top of the stapler (as though you are going to put staples in), does the pusher slide freely back and forth? It might be getting stuck at some point and not pushing the staples (either due to a worn pusher spring, or friction). First (after removing the staples) try spraying some light oil on the mechanism and lifting the top part of the stapler up and down a few times and observe how easily it moves back and forth. Also, with the top open try GENTLY sliding back and forth a little - if it slides fine with no sticking, try loading staples and using stapler. If it slides ok, but doesn't quickly return to it's "normal position" when pulled so as to put tension on the spring, rhen the spring may be worn and need replacing.

You didn't list the make and model of your stapler but if it's not driving the staples flush with the surface here are some possible causes:
1. The wood; If you are driving long staples into hardwood or knotty lumber you may have to use shorter staples to see how they set.
2. Stapler settings; Turning the air pressure up isn't the answer to driving staples deeper, it is only harder on the stapler. Most staplers work in the 90 to 120 psi range. The lower pressure you use the longer your stapler will last. Check/adjust the depth of drive control on the stapler to determine where the top of the staple is driven to.
3. Broke stapler; If it's not driving them to the proper depth but the level they are driven to is consistant, you may have a damaged piston o-ring/seal or the end of the driver is broken off. You'll have to go into the gun or take it to a service center to check these things.

The staples load on the underside of the stapler.
Step 1 Push down and retract the stapler pushup mechanism.
Step 2 Position the stapler so that the moving hammer handle is down
and the staple exit is up
Step 3 Load the staples into the chamber on the bottom with the points up.
Step 4 Push the pushup mechanism into the locked position until it latches, you will feel the spring resistance as the staples are pushed into place.

You shouldn't have to do anything to the MIIIFS flooring stapler to shoot 2" staples. It is designed to shoot 1 1/2" to 2" staples right out of the box. If your stapler won't feed 2" staples, check the magazine all the way up to the power head for any foreign material that may hold up your staples.

When a stapler stops working it is because it has jammed.Try to open it by pulling on the silver bottom part while holding the top black part there is a release on the bottom.Press the release at the back and unload staples.You should see jammed staple in feed,clear it them.Reload with new **** of staples.It should now function.Use a pin or paper clip to clear pull out jammed staples.

Did you look for a staple jammed in the driver mechanism? If the piston is stuck down, it won't respond to the trigger. Try smacking the top of the stapler onto a wooden bench to see if the force will release the piston. Make sure that you use air-tool oil for lubrication inside the tool. Hope this gets you running!

If not the power source or cord, the next activation point would be the trigger. Does the stapler make any sort of noise when the trigger is depressed? What type and model stapler is it?