Could be a number of things, but re-check the crank position senor (the one on the back of the engine, the front one is diagnostics only, isn't used by the computer).

Most likely the sensor is bad or the ignition computer is toast, although your problem actually sounds like a fuel delivery problem to me instead!

If you are lucky, this is a bad overvoltage protection relay (behind the plastic cover behind the battery) -- if you still have the one with the red single fuse on top, replace it, it's very likely toast by now.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!