Remove the rubber hose from the inducer fan motor.
Then use a paper clip to clean out the connection on the inducer fan motor that the rubber hose attaches to very good applying force if necessary. The paper clip should go all the way through touching the fan blades. Replace the hose when finished then attempt to turn the heat on.
Did you go on the rooftop to make sure nothing is blocking the vent pipe?
I will opt out so another expert can assist you because I am stomped.