Check for spark at the plugs - all of them. Then trace backwards, i.e.; coils, switchbox/powerpack, trigger, etcetera.
Having happily lived with Mercs most of my life, and having undergone EXACTLY that scenario with a '92 XR4, my guess is trigger or switchbox. But that's only a guess.
My wife got rather upset when for the 2nd time we were 9-10 miles offshore and the motor wouldn't start 'til it cooled down completely. :-(
My motor had a bad trigger due to deterioration of the wiring insulation. During diagnostics, we discovered my switchbox wasn't very good, either. Changed those out and the motor ran perfectly another 5 years/300 hours before I repowered with a 90 Optimax.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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