Radio Issues

I've got a 98 venge with the infinity stereo. Recently it has been shorting out then coming back on, until one day when it cut out completely. I've checked, fuses, grounds, tried putting in another infinity amp, even tried a new deck, nothing worked. The head unit keeps time, shows display, keeps all the radio stations programmed but absolutely no sound comes through the speakers. I'm not sure where to look from here. If anyone has any tips or help, im all ears! Thanks in advance!