Not to suggest you're daft, but, to be sure everything's how it should be (because who knows what strange behaviour might otherwise happen), have you fully charged your battery?

Do you ever get any ignition lights lighting up? Oil lights etc.?

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg