What the deuce happened to my sewing machine?

I have a newer-model Singer sewing machine. Let my friend borrow it, and it came back magically not working.

It powers up fine, but it won’t spin. I’ve taken the case off as much as I could and checked for jams – nothing. The rod isn’t bent. All necessary pieces of the bobbin casing are intact and installed correctly as far as I can tell.

I can manually spin the wheel in reverse, but won’t spin at all forward. When I do spin it in reverse, it gives a low “click” each full rotation.

Any ideas, crafty Jellies?