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Do you have a security system in your home? Sometimes the door shut sensors get out of alignment and the door strikes the sensor. This is the exact same problem I had with my door.
Remove the cover and check the drive gear. It is a white nylon gear just in front of the motor. It will be obvious if it is bad. Tell me - if it won't open how do you know it won't close?
The motors is cought on something check the motor if it moves inches it will move a yard the question is the motor is it getting power? if so is it stuck on its own drive chain? Check these things you be glad you did.
I had the same problem. Took the cover off of the opener and found that the gears were stripped on the unit. Motor was fine. You can order gear replacement kit for the unit. They are a plastic type sprocket and worm gears. The kit comes with spindles and all necessary clips. You have to take the unit off the ceiling to replace the gears, but the process if very easy to do. Parts kit about $40 on line, much cheaper than a new door opener. Total process took less than 2 hours, including getting the unit down and back up again.
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