i recently bought a used (sorry pre-owned) 2004 330xi sedan w/ navi

. but the radio doesn't work

: . none of the controls work. i can, however use my navi

.
the dealer (non-BMW) said it could be a fuse in the back of the stereo that shorted out. i checked the fuses for the radio/navi (#7 & #41) in the gloveboxjust to be sure they weren't shorted out. they were fine.

used:
anyone have any clues? i'm taking it to a BMW dealer in the morning to get it checked out.
thanks for any input.