I am at my wit's end. The original head unit was replaced with an aftermarket unit and worked fine for a few months and then sound stopped working all together. Fuses are all good. Replaced the head unit and bypassed the amp and it worked fine for a few weeks and now I am back at the same problem. Head unit powers on and everything appears to be working but I am not getting any sound from any speaker. If anyone can even point me in a direction I would be very grateful.