I'm sure this has been covered, but I did a search and I couldnt find an answer to my problem. I have a stock stereo with cd/dvd player. When I connect my aux input cord to play off my iPhone I get a loud annoying whine. I have heard this is a ground loop problem. I have to turn the radio way up to get it to blend in with the radio. I'm under warranty so should I just take it in?? I know its my unit because I have tried other aux input wires and also have tried my iPhone in my wife's Tahoe. No whine in the Tahoe. All help (except smarty pants remarks) are appreciated. Thanks guys.. I'm a newbie to the site and like alot of the info on here.