If your garage door won't open, you need to troubleshoot systematically to identify cause and restore function or gain access while ensuring safety. First, check power, as opener may be unplugged, breaker tripped, or GFCI tripped, so ensure opener lights are on and outlet works. Check if manual slide lock on door track is engaged that physically prevents opening and disengage it. Try wall switch, as if wall switch also fails, problem is opener or mechanical, not remote. Inspect safety sensors near floor for dirt or misalignment, as blinking LEDs indicate blockage, so clean lenses and align until solid. Listen for motor humming, as humming with no movement suggests disconnected trolley from emergency release cord pulled, stripped drive gear, or door binding due to broken spring or off-track. Try opening manually by pulling emergency release cord, usually red cord, and lifting door; if door is very heavy, won't lift, or falls, torsion spring is likely broken and requires professional replacement costing 200 to 400 dollars due to high tension danger. If door opens manually but not with opener, trolley may need re-engagement by pulling cord toward door and running opener. Check remote battery and reprogram. Check for lock mode engaged on wall console that disables remotes. If door is off-track, do not force, call professional costing 125 to 300 dollars. For immediate access, use manual release to open door and secure with vice grips on track to prevent closing.
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