Now this will sound strange, I had '94 850 Turbo, 90K miles, and it would do similar things that your are saying, by accident, I realized something that changed it. You know where the headlight switch is, and how you can have it set for 'day time running lamps' vs. headlights on; when I left it in the headlights on position, it would never start, swithed it off, started like a champ. Never had any indicator lights etc, similar issue, took to dealer, they couldn't figure it out. Now this could be a fluke loose connection, and that switch may have just triggered something, but it worked.