Good day to all.  I am still working out the bugs of my older F700BT that I installed in my 98 Lincoln Navigator about 2 months ago.  The issue that is driving me crazy now is that I hear no sound when playing music from an SD card,  The unit sees the card, I can change to the SD Card as the audio source, it plays the file, but no sound.  I've search this forum and the closest thing I can find is this thread:  http://avic411.com/index.php?/topic/26735-wont-play-any-music-off-my-sd-card-plz-help/?hl=port&do=findComment&comment=198203, but it is a slightly different issue.  The SD card is freshly formatted in FAT32 and all music files are mp3.  Any help would be greatly appreciated as the local radio stations are driving me CRAZY!!!!