F4 Key acts like it is stuck

I acquired a used MacBook Pro Model 1.1 running 10.5.5. The other day I noticed that my display showed the decrease sound widget like the F4 was being pushed. The system acts like the F4 key is in fact being pushed... if you raise the sound it goes right down again. i popped the key to make sure it wasn't stuck.. i used system preferences to make it so i had to use the fn key to make a function do the function.. and that is the wat all the function keys except f4 now operate
It would seem that I have some sort of hardware problem but any thoughts? No I don't have a warranty and no I am no where near a service center... I would be happy just to make it stop what it is doing

a bad head set was causing the problem

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