Your blades are stuck together.
Had the same problem: when I turn on the trimmer, the motor would hum but the blades won't move.
What I did:
1. Sprayed a ton of wd40 between the blades
2. Took a screwdriver and kinda wedged it between the blades to get them unstuck. Also removed some guck between the blades.
And it worked!
Having just stripped down my hedge trimmer because it would not work I can say that the synptoms of blades not moving, motors buzzing or worse - smoking would suggest that the blades are catching on each other and not allowing themselves free passage over each other. My solution was to disconnect it from the electricity supply to prevent electrocution and sudden activation of the trimmer and to strip it down and turn the motor by hand to see which part of the blade was catching. Once located I noticed that the blade edges were damaged. I then got out a file and filed the roughness off. You may be able to do this without having to strip it down. Please remember to disconnect from the electricity supply. If you electrocute yourself or cut off your fingers don't point the finger of blame at me!
Take out the 4 screws (flat screwdriver) holding the front blade guard, then remove blade guard. Take out the 4 screws holding the handle on (phillips screwdriver) and slide the handle down over the blades. Get a ratchet and socket screwdriver and remove the 6 nut & bolts that hold the blades together. Next remove the 6 screws holding the body on with a flat screwdriver, and you may need a flashlight for some of them. With the hedge trimmer laying down flat, remove the body. Inspect the bottom of the motor where the blades oscillate. 9 times out of 10, the bottom blade will slip down past the bottom piece which holds them in place and the blades will not turn and you will get the electrical hum. Slide the blades opposite of one another until the bottom blade moves back into place and is below the lip of the piece that holds them in. Now re-assemble in reverse order and you should be good to go.
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