On a 7 yr old Sears garage door opener, the door closed ok 3 days ago but now will not open with remotes, wall switch or keypad. The green LED on the wall switch is blinking but holding lock button down does not stop the blinking. When I push the light switch, the opener light goes on then immediately goes off. Holding the light switch down, the light blinks off and on and there is a ratcheting or clicking noise coming from the opener housing. The door sensor LED's are on.