We have a MacBook Air in our office. Sometimes it doesn't start. Here are some links for reference:
- support.apple.com - If your Mac doesn't turn on or start up
- support.apple.com - How to reset the System Management Controller (SMC) on your Mac
- support.apple.com - About the screens your Mac displays as it starts up
- support.apple.com - About macOS Recovery
If that doesn't help, who you gonna call? Ghost busters!
Remember, even if your Mac doesn't work, it was very expensive and came with a modern design. Still some hipster points just leaving it on your desk with the apple symbol clearly showing.
Here are a few links that might help you understand macOS better: