I am pretty sure its a 1/2 hp..Go on ebay there like 34 bucks

you can buy a new belt to try that but if that's not the problem the door might be a litlte heavy i am not sure how they work i think its like pulley system. or you can buy some belt dressing at any auto parts store or any auto parts department at walmart or similar department stores. its in a spray can like spray paint and you just spray it on the belt. you can put it on while the door is in motion to get all of the belt or just spray in on there. there is an method i know some old timer mechanics use and thats get some ivory bar soap and with the belt moving let it rub across the belt side that touches the drive pulleys.

I think the last reply dident understand the question. I'm having the same problem now. Nothing seems to work but the sensors by the door are still lit up so the unit is getting power but just seems "dead" I'm thinking logic board but can't seem to find any answers.