First, the screeching noises are probably from your belt tensioner wearing out and needing replacement. Or the belt is not properly seated on the tensioner and needs readjustment. No biggie there.
If you have to keep the start button pressed for the dryer to keep spinning, you may have bad centrifugal switch. That switch is built into your dryer motor. Therefore, the motor will have to be replaced... BIGGIE!
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Ge dryers have a belt sensing switch inside that won't let the dryer run (just as you describe) when the belt breaks or comes off. My guess is you broke a belt. With door open---hold in button door switch and hit the start switch to get it too run a few seconds. Watch the drum and see if it turns. My guess it will not. Belt is a long skinny band that goes all around the drum outer area and then down around the motor.
broken belt or broken broken belt switch most likely. Open the door. Hold in the door switch and push the start button. Does the drum turn? If it does turn then the broken belt micro switch is where I would look first. If the drum don't turn of course I would replace the broken belt. The only Kenmore dryer that has a broken belt switch is the 4 wheel drive model. Here is a video which shows how to get into this dryer and replace the belt:
The power button is usually called a "start" button. For as long as you hold it down, it provides power to the motor. When the motor gets up to speed, centrifugal force holds the switch closed for you. This is why a quick (short) opening of the door will not stop the dryer and a quick press of the start button will not start the dryer.
This, however, does not explain the noise...
The motor turns a belt which wraps (sort of) around a pulley which is on a spring (and also around the drum). The spring should hold tension on the belt, but the belt should not be so resistive (drum refuse to turn) to cause the tensioner to strike anything.
Can you turn the drum by hand?
The drum rides on two wheels. They should roll smoothly.
I assume the buzzing quit when you release the start button. Open the dryer door and slowly rotate the dryer drum in a counterclockwise (CCW) direction. Rotate the drum 2-3 revolutions and then shut the door and see if it will start. If it continues to just hum and not start could indicate a voltage issue, motor issue or a friction issue. Open the door again and locate the door switch plunger in the upper or lower corner on the hinge side of the drum opening. Hold the plunger in while someone begins rotating the drum counterclockwise. While turning the drum counter clockwise and holding the door switch plunger inwards press the start button. If it starts, there is likely a friction problem or motor problem.
he "broken-belt" switch is open due to your broken drum belt,replace the belt and it will start,its there to reduce the fire hazard from the drum not rotating and the clothes starting on fire from this,it shuts off the heating element also
probably has a broken belt,there is what is called a "Broken Belt" switch by the motor inside on the idler pulley tensioner for the belt,if the belt breaks this switch opens so the dryer wont run without the drum turning so as not to overheat and burn your clothes,replace the drum belt and you should be good to go
ALWAYS UNPLUG YOUR DRYER BEFORE STARTING ANY REPAIRS
Your problem sounds like drum rollers have flat spots on them or in need of lubrication, or maybe your drum belt has slipped off of the idler arm pulley.
If you have a front loading machine. Note: This method works with most front loading machines.
Remove the electrical console that holds the timer switch, start switch, etc. from the top of the dryer. Note: Some tops hinge and tilt backwards so they do not have to be removed and the electrical consol with stay with the lid. Also remove the lint filter and the screws holding the lint filter housing in place. Be REAL CAREFUL not to knock any of the wires off of the timer switch. Then remove the top of the dryer. Remove the front of the dryer. This will expose the drum and belt. Remove the drum and belt and this will expose the drum rollers, idler arm pulley and motor. Now is a good time to check the belt to see if it has slipped off of the idler arm pulley and also to check the belt condition for wear. Be sure to note the route of the belt, this will come in handy when you go to reinstall the belt. Check your drum rollers for flat spots or wear, if they have flat spots or wear on them replace them. If the drum rollers don't have flat spots or wear on them then they probably only need lubrication. Lubricate the shaft of the rollers with a good grade of machine oil such as 3 in One oil. Reassemble the dryer, plug back in. This should solve your noise problem.