My '95 850 has suffered "Lawn mower syndrom" so did my '90 740 turbo a few years ago! The technician (I had the car towed to my dealer) told me that this was common, and he could tell what happened because the car turned over too fast. This happened when I moved the car four times to keep it out of the sun when I was giving it its first wax job. Normal repair for this (I tried to start it a lot) is new oil and filter and a new set of plugs. It's been 6 monthe since the incident and the car has performed flawlessly. It's fun to crank it up once and a while anyway.

My theory is this - When you run the car for a very short period, the only thing that gets heated up is the valves which expand and stick in place when the car is shut off.

Standing orders in my house - one of our cars is never started unless it is brought up to operating temperature.

My technician advised me to drive the car like I stole it at least once every two weeks. One posting that I read about this issue stated that Volvo advises running the car at 6500 rpm or so for 5 minutes once and a while.

The recommended solution if you think that this has happened - Put the gas pedal to the floor and crank the car forever and it may start. Do not take your foot off the gas or shut off the starter as these actions put more fuel into the engine. There are differences of opinion as to this treatment of the starter.
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2 8s & 2 7s 600,000 miles total