troubleshooting fathon 212 subwoofer; help ?

my subwoofer stopped working for no apparent reason. Here's my only clues : The calibration light flashes. I have two woofers and the other one works when I switch the cables around. Pushing defeat or demo does nothing. Can anybody help ?
The calibration light flashes when you run ARO and it doesn't finish calibrating. Switching cables around fires one of the two drivers but yet the calibration light still flashes? Call JL Audio, they are great to work with.