MacBook Air Not Always Responding To Power Key!
My client brought in a MacBook Air (11-inch Mid 2013) saying he could not get the thing to turn on. The charger LED would come on green then amber, but it would not respond to anything.
Stripped it down and didn't see any clear liquid damage or anything else out of the ordinary, slapped it back together and that dang thing turned on soon as I plugged in the battery!
Couldn't login with the built in keyboard or even an external for some reason, then the client informed me that the shift key was stuck. Traced that issue back to the trackpad for some reason. I reset the SMC and the machine seemed to respond properly to the power button during random tests over a 48 hour time span.
Ordered in a trackpad and replaced it, put together, booted when the battery was connected, shut it down, pressed power... nothing.
Reset the SMC, LED changes states but will NOT power on. Disconnected power and battery, plugged back in, boots up, get into OS, tap the power key, shuts down.. proves power key is functional.
Tap again, nothing. Only way this machine will restart is if the battery and adapter are unplugged and reconnected... besides that, runs like a dream. Reset PRAM and SMC, no change.