Verify and indicate in which part where the buzz is coming from. It's the timer motor if it's coming from behind the timer knob; otherwise, it is the dryer motor at the base of the dryer.
The drum belt has slipped off if the dryer motor is the one that buzzes and the dryer blows out hot air. Otherwise, the
dryer motor (part number Y303358) is stuck; replace it.
Check the continuity of thermal fuses, one on the blower housing and one on the heater enclosure, if the buzzing sound is coming from the timer motor. These thermal fuses are wired in series with the dryer motor and will make it inoperable should any of the thermal fuses fail. Replace also the cycling thermostat should the
thermal fuse (part number 306604) on the blower housing has failed and the high-limit thermostat should the
thermal fuse (part number 307473) on the heater enclosure has failed.