Out of the blue, my daughter's 1991 940SE wagon refuses to allow the key to turn all the way to the start position. Run position is fine-steering wheel unlocks,indicator lights all come on, radio. But when you try for a start, the key stops just shy of that position. The radio powers off (as it does when normally starting car), but the key does not complete the motion and no starter action. The shifter is always free to move from any position to any other-it's not being locked with key off or out. I tried engaging the starter in all key positions in case it's the P/N safety switch-no good. This car is basically a 1991 960 on the inside (they were not imported that year) with a 740/940 turbo drive train.Any help appreciated.