I have a 1995 craftsman garage door opener, that has a 3 button remote but it won't program. I had a loose wire, fixed that now remote won't work I pressed the green button and the remote just like said on back but the light just goes off never flickers. I spent 2 hours on it last night and still won't work. and yes I changed the batteries 3 times. PLEASE help I only have one remote. thank you