If you are equipted and prepared to do the tests listed in the DIY section under "Evaluating engine controls", I would be glad to go over your results or give direction. I would test EHA current to see if cold start enrichment is taking place. If totally dead I would suspect the OVP relay.
If you are not prepared to do those tests you should find someone who can.
Bosch Master, ASE Master, L1
33 years MB technician