My Powermatic 66 table saw won't start. Tried to turn on my Powermatic 66 table saw this morning. Blade moved one half inch as if trying to start. Tried reset button on motor, still nothing.  I believe it may be the electronic starter, but unsure how to test.

Your saw motor is equipped with a two speed internal start switch. Over time saw dust will get into the contacts and cause the points to burn. You can pull the end off of the motor and take some 400 grit sandpaper to the contacts to clean them( there are two sets of contacts one works in the out position the other in the in position) it will be the set in the in position that is the problem. Gentle clean them, reassemble the motor end cap and it will work fine. I have to do this about once a year to my saws. I use my saws about 25 hours a week. I have been doing this to one of my Powermatic saws for 31 yrs. now.

Solution 1 hit the nail on the head. I recommend blowing out the windings while you are at it and sealilng up the ********** (junction box) with RTV. I see a lot of these machines that have been wired half assed and end up with a 2 screw connector on the JB. This lets in dust and this is picked up by the internal motor fan and distributed in the motor. Cleaning out the motor will make it last much longer and may even prenvent a fire.