GENIE GARAGE DOOR OPENER DOESN'T GO UP OR DOWN MAKES A GRINDING NOISE WHATS UP?

If you can see the screwdrive actually turning you probably have a trolley(attached to the red cord) worn out. It has a 2" long rack of teeth inside. They are softer than the screw and wear out first. To remove it simply unplug the opener, remove the pin holding the top of the door arm, unbolt the track from the front bracket and slide the trolley out the front of the track. Examine the teeth to make sure they are worn. Usually the noise you hear is so loud you would think the thing is going to fall down. And make sure the door goes up and down smoothly. A bad working door or a broken spring can wear out teeth quickly.