HRX217VKA won't start

Purchased last July at HD after 19 years with 16"(?) Honda.
I've used this new one less the 10-12 times and now in the midst of using it, it won't restart after simply emptying the grass bag!. Plenty of gas, gas knob in correct position. HD is no help via "chat", "too bad, we only sell 'em"!
Any suggestions?

Thanks