The most common cause of the gun not firing is loading it with the wrong staples. Look at the packaging for the staples and see if it lists the gun. Staples are NOT universal and are make for specific staple guns.
It "sounds like" it is jammed. You may have to pull out the staple with needle nosed pliers. e`1
How to Load Staple Gun
How to Troubleshoot Staple Gun Hunker
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