Powers on, then powers off as if power button is held down
The other day, I opened my MacBook Pro and was surprised that it was shut off completely and not just asleep, but no biggie until I start it up and about 2-3 seconds later it shuts itself off. Tried it several times with the same result. I zapped the PRAM, tried booting restore volume as well as another startup disk, and none of that worked. Once or twice, it would boot up fast enough to see my desktop and click a couple of things to see that everything looked okay once in.
Then I reset the SMC. At first, it bricked. The power light on the charger went off and it wouldn't start at all no matter what I did. So I took the cover off the back and disconnected the battery which made it light up again, but still powered off after 2-3 seconds of coming on.
From my troubleshooting, I'm pretty sure there is something wrong with the power button. It acts as if it is stuck. Maybe something got into it? I popped the button off and blew some air in there but no sign of moisture or damage from the top.
Is there any way to test the power button? Does anyone have another theory or troubleshooting ideas?
Is this a good question?