Sounds like a few possibilities. First ones that come to my mind are:
1.) Batteries in the cam or the board's battery for that matter
2.) Ribbon cable from the hack out of alignment inside the cam
3.) Solder connection on board for flash compromised
Try putting new batteries in both cam and board, then leave the cam hooked up to the board and try it indoors to test. If that doesn't work but it flashes when unhooked from the board, seems like #2 or #3 most likely.