My MBA power button is not functioning (on or off). I would like to know how to turn it on, in case the MBA is accidentally shut down. I have seen the technician do something inside but it's not open knowledge. Can anyone share their technical experience pls. I am confident I can, given specific steps. Thanks!
Since you think it is a permanet damage the best option is to replace the keyboard.
If you are not sure it is a permanent damage and before you replace the keyboard consider this:
There is a tiny spring loaded contact under the key cap.
Sometimes (rarely) a food or dirt get stuck in there.
1- Use a air can and blow around it, hoping to blow out the dirt.
2- Use a Alcohol (with Computer in OFF mode) soak it, wait for 10-20 minutes. Use Hair blower and warm it up to evaporate the alcohol (not to hot)
3- Buy new and replace the keyboard, it is not a walk in the park but doable. It might cost you aprox $60 for keyboard, and you will need a special screwdriver. Estimated TTC about 2 hours.