Desktop Mac or MacBook won't turn on，Or maybe it can't be launched via the Apple icon? Don't worry，Although it makes people irritated，But it's usually fixable。
Here are all the steps you need to take to restart your Mac。Follow the steps in order，until the problem is solved，Or jump to the applicable step。
1. 检查电源连接
•确保你的Mac插上了电源适配器，and the adapter is connected well。For desktop Mac，Make sure the power cord is also connected to the electrical outlet。
2. 重新启动电源
•对于最新的MacBook，Disconnect the power cord，Then press and hold the power button for 10 seconds。
•For older MacBooks，Disconnect the power cord and remove the battery for at least 10 seconds。
•For desktop Mac，Disconnect the power cord for at least 10 seconds。
3. 以安全模式启动
•按下电源按钮，Then immediately hold down the Shift key until you see the login screen。
4. 重置系统管理控制器（SMC）
•台式机Mac： Unplug the power cord，wait 15 seconds，then reinsert，Wait another five seconds before restarting。
•2018 MacBook Pro及带有T2芯片的MacBook： Hold down the right Shift key、Left Option key and left control key for seven seconds，Then press and hold the power button for seven seconds。
•没有可拆卸电池的MacBook： Hold left Shift、Option、Control and power (or Touch ID) buttons，Lasts 10 seconds。
5. 重置NVRAM或PRAM
•启动时按住Option、Command、P and R keys，Don't let go until you hear the startup sound。
6. 运行苹果诊断程序
•按下电源按钮，Then hold down the D key until you see the language selection screen。After selecting language，Start running tests。
7. 使用恢复模式工具
•按住Command和R键启动到恢复模式。Repair your hard drive or SSD using Disk Utility。
8. 在恢复模式下重新安装macOS
•如果以上方法都未解决问题，Choose to reinstall macOS。Select Reinstall macOS from the menu，and follow the on-screen instructions。
Go through the above steps，You should be able to fix most Mac won’t turn on issues。If the problem is still not resolved，May require further hardware checks or professional support。
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