OralB Triumph Toothbrush: Hear hummimg but top dont move

OralB triumph type 3745 turns on but it won't do anything. I can hear a hum but it won't vibrate

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0