Is it firing as if there was no ball in the breach? If so, odds on your eye is playing up. You should ALWAYS take the eye cover off after any hits on your marker, and make sure there is no paint on the wires/board, and also make sure the eye itself is clean and dry.
I have just had to order 2 new eyes for my Eblades as I accidently left them for ages with paint jammed in the eye cover.
If it is not this, then I am out of ideas.