1.苹果笔记本Air无法重装系统
提示你“没有可以引导启动的设备，请插入引导盘，并按任意键继续”。
产生这个错误的是由于必需的注册表配置单元文件损坏或丢失而无法加载,一般呢可能是因为硬盘损坏或其他一些硬件问题而损坏.另外如果驱动程序在加载到内存中时损坏了注册表数据，或者注册表加载到的内存有奇偶校验错误，可能也会出现这种现象。
解决方式：
1.进入bios看看系统引导设备设置有没有错误。如果你用的是硬盘引导的系统，看看第一引导设备是不是hard
disk.不是的话，把它调成hard
disk
2.如果已经设置成硬盘启动的话，再考虑是不是操作系统的引导文件损坏或丢失。如果是这种情况，开机插入系统盘，等进行到有“系统修复控制台
”的时候，选择这个选项。
3.硬盘接触不良或损坏。（这种情况不太可能发生，但可以考虑。）
苹果笔记本Air无法重装系统
重启电脑 按住command+option+R
下载网络恢复磁盘
点击磁盘工具 左上角下拉箭头
点击所有磁盘格式化磁盘
一般这个格式化都可以成功的
好多年没玩苹果的电脑了，没记错的话开机按住option+R键，帮你找了下：参考苹果：
Reinstall from macOS Recovery
macOS Recovery makes it easy to reinstall the Mac operating system, even if you need to erase your startup disk first. All you need is a connection to the Internet. If a wireless network is ailable, you can choose it from the Wi-Fi menu in the menu bar. This menu is also ailable in macOS Recovery.
1. Start up from macOS Recovery
To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following combinations on your keyboard. Command-R is generally recommended, especially if you never installed macOS Sierra 10.12.4 or later.
Command (?)-R
Install the latest macOS that was installed on your Mac.
Option-?-R
Upgrade to the latest macOS compatible with your Mac.
Shift-Option-?-R
Install the macOS that came with your Mac, or the closest version still ailable.
Release the keys when you see the Apple logo, a spinning globe, or a prompt for a firmware password. When you see the Utilities window, you've started up from macOS Recovery.
macOS Utilities window
2. Decide whether to erase (format) your disk
If you need to erase your disk before installing macOS, select Disk Utility from the Utilities window, then click Continue. You probably don't need to erase, unless you're selling or giving away your Mac or he an issue that requires you to erase. Learn more about when and how to erase.
3. Install macOS
After starting up from macOS Recovery, follow these steps to install macOS:
Choose Reinstall macOS (or Reinstall OS X) from the Utilities window.
Click Continue, then follow the onscreen instructions to choose your disk and begin installation.
If the installer asks to unlock your disk, enter the password you use to log in to your Mac. If it doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk.
macOS installer window
Please allow installation to complete without putting your Mac to sleep or closing its lid. During installation, your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.
If your Mac restarts to a setup assistant, but you're selling or giving it away, press Command-Q to quit the assistant without completing setup. Then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete setup.
