i bought a used alpine 9831 last week and had no problems until the other day when i turned it on and only got sound from my subs. i checked the rear speakers and they werent blown and the front were just replaced with infinity so i highly doubt they are blown. I checked the wiring & didnt see anything. I hit the amp reset button on the deck, which worked for a few days and now it messed up again! anybody wanna help me out on this one??