Apple computer users may experience a situation where their computer will not boot up. This may be due to a number of reasons, such as a corrupt operating system, a hardware issue, or a software conflict.

If your computer will not start up, the first thing you should do is try to restart it. If that doesn’t work, you can try to boot up in Safe Mode. To do this, press and hold the Shift key while you restart your computer.

If your computer still doesn’t start up, you may need to reinstall your operating system. To do this, you …