I just bought my first home and it came with a garage door opener. The home is only 5 years old so the opener can't be that old. When we did the walktheough the door worked just fine. Needless to say when I opened it after closing it did not work like before. When I push the button on the wall the door begins to open and stops about 4 inches off the ground and the door slides back down but does not go to the ground. It remains open about 2 inches. When I pull the manual release it falls to the ground.

Can anyone offer any advice? I have never had a opener and this is all brand new to me. It is a chamberlain whisper drive opener. Anybody know anything about this or has seen this before. Any advice would be greatly appreciated. Thanks.