Today, I ran my engine for several hours. I pulled near an area that I wanted to check out with my sonar, and the engine made a single clunk noise and stopped the motor dead. I was only moving about 10 mph. My first thought was that I hit something in the water. I lifted the motor, and the prop was not damaged at all. I lowered the motor, and now the motor will not start. It just makes a single clunk noise when the key is turned. The throttle moves in and out of gear. The kill switch is in place. I have power to the motor because the trim works. Any ideas would be greatly appreciated.

 

Sounds like it seized.