Scott,

The best bet is to contact Great Planes tech support. They will likely offer to have you send in the controller for repair/replacement.

G3 will not run using a G2 controller. You can use the USB G2 controller as a second G3 controller (i.e. for split screen) but not w/o the real G3 controller connected.

You may also find an old controller for sale on ebay ... I picked up a spare for my G2 (non-USB version) that way in case Great Planes stops supporting the older hardware.

Good luck,

Carl