Trackpad click button is jammed

"Try to insert a sheet of thick paper around the button to remove dust, dirt or a grain of sand that can be stuck there.

You can't access the button from under the top case so if the paper manipulation don't work you'll have to replace the upper case assembly."

"Ok, this may seem a little weird. My trackpad had the exact same issue and I solved it by blowing in it rather hard. Press your lips on the side that is not ""clicking"" correctly and blow a few times. Make sure your lips build a good seal though.

Or, a short burst of air from a can of can'ed air.

May really just be dust/crumbs stuck under there. This should do the trick though."

"Usually caused by swollen battery pressing on the underside of the trackpad.

You can remove and try and bend the battery outwards for a temporary fix, but

new battery is the only permanent fix."

"I cant believe PRAM reset worked …

Mine stopped working on a very new laptop. I am confident no crumbs or dust was a factor. Turned upside down tapped around no joy. Blowing did not work, paper did not do anything. After few days, decided to give a try to PRAM reset and that worked :) Makes no sense to me but started working right after the reset, give it a try before putting WD40 on it.

PRAM reset plug in power and shut off. HOLD Command + Option + P + R, while holding press power few times and you’ll hear a chime."

"Having dealt with A1181 button issues for many years now, I've found the situation often cannot be resolved, but the first and most effective step to take is to remove the battery (and make sure the battery isn't swollen -- that will cause a problem in itself) and firmly press up on either side of the button from inside the battery cavity. This will usually cause a cracking sound, as a seal formed by years of gunk buildup is broken. This alone will often restore the ""click"" to a ""soft"" button.

If that doesn't help, take a look at the underside of the button -- you'll see there is a strip of metal down the center of the button. Take a pair of tweezers and slip the flat end into the small space between the left side of the button and the metal strip, and then pry slightly, making the small space first about 1mm, and then if that doesn't do it try 2mm. This reduces resistance between the left side of the button and the ""clicker mechanism"" and often restores usability.

But if that doesn't help, it's most likely a lost cause. These topcases are flimsy, and the more you mess with them , the less the chance they are ever going to work again.

Also, as one final thing to try, put the battery back in and see if the push of the battery against the underside of the button helps -- sometimes it does. OEM batteries are best for this since they tend to be thicker."

I thought I would be the odd one out and have to say the blowing didn't work. Instead, I get to say that the blowing was the first step. Then some (unintentional) gentle pressure unlocked it with a click sound as I resorted to having to use the right bottom pad only. Voila! All better now!