Elfen said:

I've have had a couple of Kensington Trackballs for Mac (ADB) and a joystick and they worked from System 6 to 7.6.1 without a driver.

Check if a mouse works on those ports, and if yes, then something in the Mouse-in-a-Box is broken.

Click to expand...

Hmm yeah, my stock mouse works fine...

I popped it open and can't find anything wrong :-/ Maybe it's the cable? I'll do a continuity check on it.

Also, I'll plug it in while the casing is open. Do you know if the optical components visibly light up, or is it an invisible wavelength?

Here's some photos: