There is a gray plug on the bottom right as you look at the back, it has no cable comming out of it. Looking in the hole where the cable comes out there are a compaster (i think) and some other thingys. if it comes lose you don't have any shooting speed on your trigger, and if it comes off, you lost any trigger at all, no balls will shoot at all.

the plug just pushes in, the two screws are missing that holds this plug in, and it points down and comes lose easy.

I would check your machine and see if you have this gray plug and if it has screws holding it in.

It looks like the cable end in the back of your computer, my wife ran off with my camra. Other mod.s that are similar may have this too!

I am wordy today!