Our 40th anniv 80 came with a very nice Alpine Head unit. The PO used an Ipod with it for the most part. Upon delivery, I was unable to get any sound out of the unit and it's only less than one year old. It seems to be working; ie plays the CD, good radio tuner signal, etc. After pulling the unit out of its home, it looks to be wired properly to the existing oem harness. All fuses are good that I can see. Is there a fuse somewhere else in the Audio system by any chance? It's NOT on mute! We tried playing a portable cd player through the Aux port and still nothing. Any ideas? Thanks.