I have a 7 year old Chamberland opener. The other day it made a funny
noise and wont move the chain at all to put the door down or up.

Very common problem is the plastic worm gear/spur gear combo. These *will*
chew themselves out sooner or later, sooner if your door springs aren't
balanced.

See my page:

http://www.truetex.com/garage.htm