Where did you feel the change?
Did the machine stop providing its usual help, or were the wheels slipping against the ground? Perhaps moving forward was normal but turning had become difficult. Describe whichever you noticed rather than grouping all three under “it won’t drive.”
Include what happened when you used the controls, based on the last use you remember. You don’t need to identify a drive part or repeat the problem for a recording.
Getting it to a shop may need a separate answer
A snowblower that has lost its drive assistance is also an awkward one to load. If a mobile repair business comes to your area, ask whether they can look at it where it sits and tell them the drive behavior has changed before anyone heads over.
That detail matters when you arrange the work. A routine seasonal appointment may not include finding the fault unless you agree on that beforehand.
The technical and safety advice in this draft still needs to be checked against the manufacturer’s instructions by a qualified reviewer. Follow your machine’s manual.
About the review process