Your TV module is running as the display driver, this means that the Nav computer is either faulty or has crashed.

Not having a map disc in would not cause the nav computer to crash, it will work without a disc in the drive.

At a guess, I'd say your mk3 (nav computer) is dead.

Try and reboot it, follow the procedure

*before* you unplug the mk3

Goto the car open the drivers door,
Then goto the nav computer, press eject on drive,
Eject the map disc,
Wait for the red led on the drive to go out,
now disconnect the 2 plugs on the back then the gps lead, wait 10 seconds then replug in the plugs and gps lead.

Go to the car and turn on the ignition and hope that the nav computer comes back, if not it's dead, replace with a MK4.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.