thats not what you want to hear.
you can buy individual modules for that sat nav on ebay, (rather than the whole unit). just check what p/n of the module is on your system and get the same one.
It has a screen module, dvd module and a radio/mark levinson module.
It a big job but better than paying 2k, you need to find out which module is broken of course., could be the display part.