Garage door opener problems

I'm going through it now, I'm all ears on this one. I'll probably just replace the damn thing though.

First thing to do is check the sensors. That's the easiest thing, and most common problem.

Everyone is saying sensors, but it may not be that at all. If the door is dropping all the way to the floor and then going back up, it probably isn't a sensor problem. The chain is running past the hard stop, the door believes it has hit something and then retreats back up. The stop may simply need to be adjusted.