Hi Stew, welcome to the forums.

The MK4 is a very robust unit and should come back to life with a good OS disc image.

Are you sure you have a mk4? what speed to you burn the cd at?

Do not use nero for burning the OS, its shite, use imgburn (its free).

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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.