Keys sticking or not functioning at timesSo I have this device come in the shop today with issues with some keys not typing at times, I did blow out the keys with...
Answer to "An unexpected behaviour and Display turned off"(1) Check the battery by replacing it (2) Could also be the front facing camera cabled could be bad or not properly connected to the board, I have seen the device get hot from a bad front camera, but that doesn’t explain why it wont power on, I would replace the battery first.
Answer to "Takes over 2 minutes to boot up, lagging while opening apps ."Sound like a software problem or you maybe low on system storage, does it ever tell you your start up disk is full? I would try to backup your data and then do a wipe and reinstall of Mac OS X