May possibly be a loose missing or worn belt.
Fix the drive belt.
You have to engage the PTO clutch slowly because the snowblower has a lot of inertia to it, especially a two-stage blower. Get your RPMs up before you try to engage. Also, make sure that your snowblower will actually turn by hand before you hook it up. It might be jammed with ice or debris or it might need lubricated.
possible broken auger belt, or one that has slipped off the pulley
Please provide the model number when asking a question like this. Different models use different techniques. Craftsman LT1200
Depress the button on the parking brake handle and move the lever down
You probably blew a belt.
did u also check the autoshutdown and fuel pump relays?
On those types of machines there should be a lever on one of the hand grips that must be held down while operating as a safety feature.
check to be sure the blades have free movement. usually if you have this problem it is caused from something stopping the blades from rotating therefore it stops the engine
if you dont depress the pedal far enough when stationary the clutch drags a little making it difficult to engage gears push the pedal all the way and you will be ok
a throw out bearing is conected to ta fork sticking out of your bell housing which is conected to your clutch ,when u engage the clutch the thowout moves the the clutch away or towards the pressure plate and flywheel depending on if you press or depress the pedal
bad brake light switch