The Mk3 has crashed and has no Os loaded.

You are viewing the graphics generated by the video module (also known as TV tuner). The video module has taken over because the nav is no longer communicating

The most common reason for deleting the OS in the Mk3 is using a Mode1 OS CD. This crashes the Mk3 during loading of the OS.

To correct the problem, ensure you use an OS disc that is in mode2/Form1.
Note that there have been no changes to the Mk3 OS since around V24, so any OS disc V24 and newer will work

But the OS format is vital.

If the Mode2/Form1 OS disc doesn't fix it, then the Mk3 has corrupt flash memory and needs to be reflashed - either by the factory repair center in Wetzlar Germany or by Autotronic in Australia