Hi Keith,
ok i confirmed the 4 points.
1.&2. Option 2 is shown in the avant service menu
3.by pressing radio on the Beo4..nothing happened
4.yes its the only cable.
to make the ckeck a little more easier...i connected the overture to beosound2000(a masterlinksystem) directly,with a new and tested masterlink cable.also no masterlink is working.
the dealer said that the ouverture was cleaned in and out...perhaps they disconnected a cable in the system?!