Home > Questions

Why Does My iMac Not Boot Up?

My iMac will not boot up. I get the Apple logo and the progress bar fills about 4/5 and then disappears. I'm left with a blank solid white screen. Will not boot in safe mode.

Best Answered by

iBoysoft author Eudora Liu

Eudora Liu

Answered on Tuesday, December 3, 2024

Usually, after you update your macOS, your iMac won't boot up and you will see a white screen stuck on your iMac. When you encounter this issue, the first thing you need to do is to disconnect all the external devices from your iMac except the power source. And then restart your iMac to check whether it can boot normally.

If not and you can't boot into Safe Mode, take the following methods to fix the white screen.

Method 1: Reset SMC. If your iMac is Intel-based, you can hold on to Control + Option + Shift keys when rebooting your iMac to fix the white screen issue on your iMac. For M1 iMac, there's no SMC on your computer.

Method 2: Reset NVRAM/PRAM. NVRAM and PRAM store certain settings on your Mac. If your iMac is Intel-based, hold on to Command + Option + P + R keys at startup. If your iMac is M1 or M2 based, it will reset NVRAM/PRAM automatically every time you reboot your computer.

Method 3: Check the startup disk. Run First Aid in Disk Utility under Recover Mode to check whether your startup disk is intact.

Method 4: Reinstall macOS. The final way for you is to format your startup disk and then reinstall macOS. After that, reboot your iMac to check whether the issue has been eliminated.

 

People Also Ask

Read More Questions

Read More Advice From iBoysoft's Computer Experts

Corrigir disco rígido externo que continua desconectando no Mac

Corrigir Disco Rígido Externo Desconectando no Mac [Atualizado]

Porque o seu disco rígido externo continua desconectando no Mac? Corrija o disco rígido externo ou USB que continua desconectando em Ventura/Monterey/Big Sur/Catalina.

Comment convertir JPEG en JPG sur Mac

How to Convert JPEG to JPG on Mac the Fast Way?

Are you wondering how to convert JPEG to JPG on Mac to upload images on a website or app that specifically requires JPG file? Here are there ways to do it.

cómo arreglar que Netflix se congela en Mac

¿Cómo arreglar que Netflix se congela en Mac?

Muchos usuarios han experimentado que Netflix se congela en Mac cuando reproduce un video o película en un navegador, lo cual es extremadamente molesto y deja una mala experiencia de visualización. Esta publicación proporciona soluciones