If you purchase a new door opener according to the information I have you can program your existing 4 remotes but the remotes that come with the new unit will not work. If you program the new remotes then your 4 remotes will not work.

The little green LED will always randomly flicker. If you key your remote it will flicker rapidly.

It sounds like you have a bad RPM sensor. It is a small printed circuit board in front of the motor. You might try replacing that.

Well I just went out and bought a new opener. It was $179 for the 3/4 Horse from sears. So now I have extra remotes that are still working good. Maybe I'll put sign up in the yard and sell them for $20. They are $39 in Sears new. My new opener is the 315 mhz type. Another question is can I use the old safety sensors for anything? The new ones are alot smaller and I will use them with the new package.

I would definitely save your old sensors. I am sure they will work if you have a problem with the new ones.

After pressing the inside garage door opener button, the garage door goes up only 2 ft, then stops. A next push of the button sends the door successfully back down, closed.
Multiple trys produces the same result: partway up -- all the way down. Nothing is blocking the doorway sensor and all machinery and connections are intact. ANY SUGGESTIONS?

Take a real good look at the door springs. One could be broken. If not, on the rear of the motor unit near where all those white wires go you will find a control marked 'up force'. Turn it about a 1/4 turn and try. Adjust as necessary. Do not adjust the 'down force'. This affects the safety system.