Your garage door opener would suddenly stop working due to several common causes that cause abrupt failure of power, mechanical components, or safety systems that prevent operation. The most frequent sudden cause is broken torsion spring that counterbalances door, as spring stores high tension and can snap with loud bang, making door too heavy at 150 to 300 pounds for opener to lift, so opener hums but doesn't move, requiring professional replacement costing 200 to 400 dollars. Power failure due to unplugged opener, tripped breaker, GFCI outlet tripped, or power outage cuts power, so check if opener lights on and outlet works. Safety sensors near floor can be suddenly bumped out of alignment by car, trash can, or foot traffic, causing receiving LED to blink and door to refuse to close, with opener light blinking 10 times, so clean lenses and realign until solid. Emergency release cord pulled accidentally disconnects trolley from door, so motor runs but door doesn't move, requiring re-engagement. Remote battery dead suddenly, or lock mode engaged on wall console disabling remotes, indicated by blinking light, causes opener to seem not working with remotes but wall button may still work. Logic board failure from power surge after storm can cause sudden stop, with opener having power but not responding. Door off-track from hit causes binding that stops operation. Cable snapping jams door. To diagnose, try manual operation after pulling emergency release; if door won't lift, spring likely broken. Unplug opener 30 seconds to reset.
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