Is your MacBook refusing to boot? Here's how to troubleshoot a MacBook that's not starting up, including what to test for and what to do to fix the problems.

Here's how to fix common MacBook Air issues like a slow startup, bad Wi-Fi connectivity, and occasional slow performance.

If you want to prevent your MacBook from starting up when opening the lid and connecting to power: sudo nvram BootPreference=%00 To prevent startup only when opening the lid: ...