Table saw won't start. Blade jump starts for 1/2 sec, but won't spin up.

I was about to rip 20 walnut boards, so I could then resaw them.
I jointed one edge on my jointer, then went over to my table saw to rip.

When I hit the power button, the blade gives a jump, but immediatly shuts off. Doesn't even give a full revolution.
I hit the red kill button, and it jumps again. Then the green button, and it jumps again.

It's clearly not a wall breaker issue, or the motor wouldn't even jump.
Suggestions?

Jet 5hp. Single phase.
It's clean under the table where the motor mounts.
All 3 belts are good.
Blade turns freely by hand.

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Table saw won't start. Blade jump starts for 1/2 sec, but won't spin up.