40V Chainsaw won't start. Batteries fresh, chain moved freely.

I have the GWZ2300 40v 14" chainsaw and it worked fine when I put it away last fall.

Today, I inserted a fully charged battery, pressed the power button (the light came on) but pulling the trigger does nothing. No noise, no tiny chain jerk, no smoke or smell.

I tried another battery to no avail (I have a 40V weed wacker, and both batteries work fine in it.)

I removed the battery, manually moved the chain, and it moves freely.

Pretty sure it is out of warranty, if I decide to open it up, what should I look for?

Thanks, Mark.