Guys: A heads up on a potentially hazardous ground incident. Yesterday, I turned on the master switch in the hangar to check something and the propellar started turning. It startled me but I reacted immediately but not before the prop made a couple of revolutions. After investigation, it turned out the starter solenoid was stuck in the closed position, continuity through both poles with the start switch wire removed. I had flown the day before for .8 and the starter was not in the start mode for that flight, I have a starter engage warning light on the my panel. Additionally, there is no evidence on the starter ring or starter teeth of any abnormal wear. I have never heard of a solenoid failing in the closed position, only in the open position. Anyone else out there ever experienced this problem? Anyway, the point here is to be aware that the prop can turn when you turn on the master. It's probably another good reason check the prop clear or holler "clear prop" or both before turning on the master. Dan