MacBook Air Laptops Have Faulty Hard Drives
Obviously Apple doesn't want to share that with you, but as I was researching how to fix an Early 2014 MacBook Air, I came across quite a few people with the exact same issue---the hard drive crapped out on them. The issue with the particular computer I was working on involved the hard drive not being recognized during start-up. You had to restart it about 12 times before the system would recognize the hard drive and actually start up. It was frustrating to say the least.