Don't worry,

The mk3 will try to re-establish connections the the DSP and TV (because it (the mk3) thinks that there has been a power cut, and not car swap), so just wait, the mk3 will work out that it can no longer "see" the TV and DSP and blank them out, this may take upto 15 minutes.

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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.