I just saw an earlier post that outlines the same problem that I am
having. My garage door doesn't want to go down. It will start to
close, go down a few inches and then go right back up again. Once it
does this the lights will blink as if the sensors are obstructed yet
they are not. I have been careful to clean the sensors of any dirt,
cobwebs,etc. and I have made sure that there is nothing obstructing the
sensors as well. I have had this problem occaisionally in the past
couple of months but it seems to resolve itself on its own for no
apparent reason as if it has a mind of it's own. I believe that the
garage door is approx. 9-10 yrs old and I have an aluminum door.

One note to mention: About four months ago I closed the garage door
and the garage door buckled in the center due to an improper support on
the door that snapped. At the time, a technician came out and fixed
the door and adjusted all of the up-down balances and oiled the door.

Any help with this would be greatly appreciated!! :-)

Thanks!