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."