I have a 2008 Fiesta ST and have only recently tried to use the aux input socket to play an MP3 player through the stereo. In short - nothing happens when I select 'aux input' on the radio. If I crank the stereo volume WAY up (almost to maximum) I can just about hear something very faintly from the right channel only but it is certainly not listenable. I have tried two different MP3 players and two different cables but with the same result.

The car is still under warranty, well only about a month to go - is this something that would be covered by the Ford warranty?