i recently had bought a used macbook air 2014 model a1466. it was working fine and then one day i went to turn it on and it showed a gray folder with question mark. i tried to restarting it once more and the macbook turned on but the screen just stayed back and the keyboard wouldnt even light up. iv tried pretty much i could find on the internet from unplugging the battery to every start up command i could find and it wont get past the black screen, i have also tried replacing the SSD with no luck the only command that happens to work is control-option-shift-power, but that only restarts it back to the black screen. going to a apple store isnt in option since im miles away from one i would appreciate any help or information i could recive.