For loss of power to the wheels, first thing I'd check would be the tranny fluid level, since you said it was automatic. After that, then maybe a broken CV or axle, or a bad torque converter, or a shifter problem having it in neutral, or something terrible inside the tranny itself.
Seems hard to come up with a single issue that would cause both loss of power to the wheels and also unable to start. Not saying there isn't one, I can't see what it might be. Maybe if by some weird fluke the flywheel became disconnected from the crankshaft, since the flywheel is the only common point between starting and power transfer to the wheels, but that would be pretty bizarre