I'd say your mk3 is dead, replace it with a mk4 they are a lot more reliable and are (for the moment) still being supported, while the mk3 is not.

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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.