Check your RCA's cable if the slipped and the 12 volt turn on line. Some amps will report as "powered on" but do not have voltage on the remote line and therefore won't do anything. If you have a digital multi-meter(DMM), Disconnect your sub from the amp and set your DMM to Ohm's. Place the leads on the + and - of your speaker, you should have a reading anywhere from 1 to 8 Ohm's (depending on the number of coils and their resistance). If you get 0.00 or a fluctuating reading, your coil might be burned out. Again, check RCA connections and remote line at the radio and amp. If you have a buddy with a system, borrow his/her sub and hook it up. Check to see if your amp has a light marked "Protection Circuit" and is it on?
Or MAYBE, Just MAYBE your neighbors got tired of you blasting your tunes all the time and disturbing the peace and quiet in the neighborhood so one of them broke into your car and sabotaged it.
