That hum is actually a good sign in a weird way. Means the opener's getting power, means it's trying. It's just not doing anything with that try. I've had customers describe it as the opener "thinking real hard but forgetting what to do next" - which is honestly pretty accurate.
Hum-but-won't-move is one of the more common calls we get. Almost always comes down to a handful of causes. Some you can fix yourself in ten minutes. Others you really shouldn't touch. Let me go through them.
Try the door by hand first
Pull the red cord hanging from the rail - disconnects the door from the opener - and try lifting it manually.
Moves fine? Good. The door is okay, problem is in the opener or drive system.
Won't budge by hand? That's not an opener problem. Could be springs, could be something jammed in the track. If it's winter, check whether the bottom seal froze to the concrete overnight. Warm water along the bottom edge usually breaks it free. Happens way more than people expect.
Stripped drive gear - most common cause by far
Inside the opener housing there's a plastic gear that meshes with the motor. It's plastic on purpose - designed to strip out instead of burning up the motor when something goes wrong. When it strips, the motor still runs fine, you hear the hum, but nothing turns and the door doesn't move.
Pop the cover off and look at the main gear near the motor. Chewed up teeth, plastic debris inside the housing - that's your answer. Gear kits run $15-30 on Amazon depending on your brand and there are tutorials for every common model. Not a hard fix if you're okay with basic mechanical stuff. Tech does it for $75-150 usually.
One thing - if the gear stripped because the door springs are off balance, replace the gear without fixing the springs and you'll be doing this again in a year or two.
Broken torsion spring - don't touch this one yourself
Look at the big horizontal spring above the door. If there's a visible gap in it, or it's snapped in two pieces, that's your problem. Spring does most of the heavy lifting and without it the opener can't move the door alone. It tries, hums, gives up.
You probably heard a loud bang at some point - that's the spring going. Some people think it's something outside and don't connect it to the garage until the next morning.
Do not try to fix this yourself. Springs hold serious tension even when broken and people get hurt doing this without the right tools and experience. A standard torsion spring replacement runs $150-250. Worth every dollar.
Trolley got disconnected
The trolley rides along the rail and physically connects to the door arm - it's what actually moves the door. If it's not engaged, the motor runs freely and hums but nothing's attached to the door.
Watch the rail while the opener runs. Is the trolley moving back and forth but the door staying still? It's not connected. On most systems you can re-engage it by pulling the cord in a different direction or just running the opener while manually pushing the door closed - it usually catches automatically. Check your model's manual for the exact steps.
Bad capacitor
The capacitor gives the motor its starting burst. When it fails, motor hums but can't generate enough torque to get moving.
Here's the test: have someone give the door a solid push upward right when the opener activates. If it suddenly kicks in and starts moving with that assist, capacitor is almost certainly it. The push is doing what the capacitor can't anymore.
Cheap fix - part is $10-25. One thing to know: capacitors hold charge even when unplugged. If you're not comfortable working around that, have someone else handle it.
Logic board going out
If you've checked everything above and nothing obvious is wrong, the board might be failing. Intermittent failures are the main sign - works fine sometimes, hums and does nothing other times. Settings randomly resetting. Lights behaving weird.
Try the wall button instead of the remote first. Wall button works, remote doesn't? That's just a remote or receiver issue, easier fix. Both do nothing? Probably the board.
Board replacement runs $120-200 with labor. On a unit that's 12+ years old, compare that number to a new opener installed ($250-400) and decide which makes more sense.
Quick checklist if you're not sure where to start
Disconnect and try the door manually - moves or not?
Spring above the door - any gap or break? If yes, call someone.
Spring looks fine - open the unit, check the drive gear for stripped teeth.
Gear looks okay - watch the trolley while the opener runs, is it connected to the door arm?
Still nothing - try the push-assist test for the capacitor.
Last - wall button vs remote. Then think logic board.
What happens if you just keep pressing the button
I get it. You need the car out and you'll deal with it later. But there are situations where hammering the button makes things a lot worse.
Broken spring and you keep forcing the opener - you'll burn out the motor or strip the gear. A $200 spring repair turns into a $500 repair. Not worth it.
Repeated attempts also stack heat in the motor. After enough tries the thermal protection trips and cuts power. Keep going and you risk actual motor damage - thermal protection can only absorb so much before it stops protecting.
Rule of thumb: two or three tries, nothing happens, stop. Figure out what's wrong before you make it worse.
Noises that tell you something specific
The hum is the main thing but sometimes there's more going on.
Grinding along with the hum usually means something mechanical with friction - drive gear or chain/belt issue. Stop immediately, don't run it until you know what's grinding.
A loud clunk then nothing - trolley hitting the end of the rail hard, or the door hitting a stop. Could be limit switches set wrong.
High pitched squealing - rollers or hinges running dry. Lubrication ↗ issue. Won't stop the door right away but gets worse fast.
Clicking repeatedly - logic board retrying a failed command. Usually points to sensor issues or a limit switch problem.
Paying attention to the exact sound helps a lot in narrowing down where to look first.
Basic maintenance that prevents most of this
A lot of these failures are either caused by or made much worse by zero maintenance. A little attention twice a year genuinely extends opener life by years.
Lube the chain or belt, rollers, hinges, and springs every six months. White lithium grease or silicone spray. Not WD-40 - it's a degreaser, dries things out, accelerates wear over time.
Check door balance twice a year. Disconnect the opener, lift the door to waist height, let go. Should stay put or drift slightly. Drops fast or flies up means springs need adjustment. An unbalanced door is the number one reason openers die early - they're carrying load they were never meant to carry.
Test the auto-reverse. Put a 2x4 flat on the ground under the door and close it. Should reverse immediately on contact. If it doesn't, force settings need adjusting. This is a safety feature, not optional.
Wipe the sensors monthly. Thirty seconds. Keeps them reading clean and saves a ton of frustration.
People who do this stuff don't usually end up googling "garage door opener humming but not opening." Just saying.
Springs and off-track doors - call a tech, no exceptions. Everything else on this list is reasonable DIY territory if you're willing to look up your specific model and take it step by step.
And if you just want someone to come look at it and give you a straight answer - GarageDoorRepairz is who to call. We'll tell you exactly what's wrong and whether fixing or replacing makes more sense. No runaround.