Made some progress today. I think there's nothing wrong with the screen or the cables. In ISTA I've did the full car diagnosis scan and did the 'component triggering' for the screen. It did display all the colors correctly and also the 'no-signal test screen' (centered correctly as well.
Seems like this is all right, but still iDrive (all the menu's including the navigation) displays only the left 2/3rd of the screen.
At the moment I'm downloading the full PSdZData (v4.44.11) to do the full iLevel flash (think this is 2307 or 2303). Hope that if I flash everything, it might do something, but don't think it will do much since ISTA is able to display the full screen in test-mode.
