The 4 most common part(s) or condition(s) which cause the symptom Dryer won't turn at all are listed below starting with the most likely. Check or test each item and watch any available videos.
RepairClinic Item # 1266808
Every dryer has a belt, and if the belt breaks the dryer won't turn. The belt is usually a very long, slender belt that wraps all the way around the dryer drum, around a tension pulley, and then around the drive motor. Over time the belt will break from normal use. A quick way to see if the belt is broken is to reach into the dryer and try to spin the drum by hand. If it spins very easily the belt is probably broken. Some dryers have a belt switch on the idler pulley arm that will not let the dryer start if the belt is broken. When a dryer won't turn, this is the first part to check.
RepairClinic Item # 2700894
If the dryer won't turn, and the belt is not broken, the next thing to check are the drum rollers. Every dryer has either 2 or 4 drum rollers. Over time these rollers wear out and can prevent the dryer from turning properly.
RepairClinic Item # 2701044
This dryer has drum support rollers. There will always be two supporting the rear of the drum, and on some models there may be two supporting the front of the drum. The rollers must spin freely to work properly. If they are worn out or start binding the motor can get overloaded and the dryer won't turn. If the dryer stops mid-cycle, check to be sure the drum turns freely with the belt removed. If not, check the rollers. Do not lubricate the rollers or roller shaft, lubrication will attract lint and cause the roller bearings to wear out faster. If the rollers don't turn freely, replace them. The roller shaft can often be reused, unless it has worn down. Clean the shaft thoroughly before installing the new rollers.
RepairClinic Item # 1330330
The motor should spin freely when the belt is disconnected. If it doesn't, check to be certain there isn't anything caught in the blower wheel. If the blower wheel is clear and the dryer still won't turn, the motor may be defective. All dryer motors have sealed bearings and can't be lubricated. Replace the motor if it doesn't turn freely.