Your garage not opening when you press the button can be due to several common causes related to power, remote, wall button, safety sensors, or mechanical failure that prevent door from lifting. First, check power, as opener may be unplugged, breaker tripped, or GFCI outlet tripped, so ensure opener lights are on and outlet works by testing with other device. Remote battery may be dead, causing weak signal that fails to reach opener, so replace battery and reprogram remote by pressing Learn button on opener and pressing remote button within 30 seconds. Wall button wiring may be loose, as two low-voltage wires connect wall console to opener and can become loose, corroded, or damaged by staples or rodents, so turn off power, remove wall console cover, and tighten terminal screws. Check safety sensors near floor, as dirty or misaligned sensors with blinking LEDs can prevent opening in some models, so clean lenses and align until both LEDs solid, sending yellow and receiving green for LiftMaster. Manual slide lock on door track may be engaged that physically prevents door from opening, so disengage lock. Trolley may be disconnected from emergency release cord pulled, so door not connected to opener, requiring re-engagement. Broken torsion spring makes door too heavy to lift, with opener humming but not moving, requiring professional spring replacement costing 200 to 400 dollars. Lock mode engaged on wall console disables remotes, so hold lock button to unlock.
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