My head unit stopped working and no lights came on anymore so I replaced it with another oem head unit where everything works fine now but after I replaced it the sound stopped playing. I replaced the amp with another oem amp and it still didn’t play any sound. Checked the fuse and they’re all good. Lost on what else to check to fix the sound! Help plz

 

Were both the head units the same?
Both Bose or non-bose?

 

Yessir I replaced bose for bose head unit

 

Maybe try disconnecting the Bose speakers in the rear deck... I'd also check for mangled wires in the rear wiring harness as well as the one behind the dash. Was the replacement amp from the same model year g35? Sounds like it may have been your old HU, so I'm dubious your original amp was the issue.