Just a guess, but if you unplug it and wait for 10 seconds, plug it in
and turn it on it may function as a reset, and start .
There is one other thing you can do when the saw is unplugged, and that
is check if everything rotates freely.
On some of the old Sears saw were here was a switch that was part of he
starting system for the motor. If debris gets into the switch the motor
will not start. FIRST UNPLUG THE MOTOR. On mine there is a cover on
the end of the motor. Remove the cover, and carefully clean the area,
making sure there rare no wood chips in the contacts.
Part of my routine end of project routine is to vacuum out all of the
ports in the motor, to remove any debris that got into the motor during
the project.