树莓派关机后无法开机的可能问题

1、更换的国内镜像源与系统版本不匹配

• 很多人在开启树莓派后第一件事情是更换国内镜像源，以提升软件下载、更新速度。此时应该注意：树莓派系统也有不同的版本，如stretch、buster、jessie等。换源时一定要找对应的源，修改配置。若更换的源与系统版本不对应，update后很容易出现关机打不开的现象。

2、树莓派供电出现问题

• 很多莫名其妙的问题都与树莓派的供电有关系。

3、树莓派配置文件出现问题

• 树莓派无法开机也可能是因为配置文件出现问题。

You’ll also need to make a small change to the config.txt file that Raspberry Pi uses when it boots.
Using a memory card reader on your desktop computer, insert the Raspberry Pi SD card and open config.txt in your preferred text editor.
Look for the following lines:

hdmi_force_hotplug=1

hdmi_drive=2

Both options need to be enabled, which you can do by removing the hash symbol and saving. These options enable VGA output through an HDMI adaptor and sets the screen resolution to a low 640 x 480.
If you want a higher resolution, remove the hash symbols from the following lines:

hdmi_group=1

hdmi_mode= 4

You will also need to edit these two lines, changing hdmi_group to 2 and hdmi_mode to 16. Remember to save your changes before safely removing and replacing in your Raspberry Pi.

4、如果树莓派配有屏幕，则应考虑屏幕是否能正常点亮

• 检查屏幕质量是否有问题。
• 检查屏幕驱动是否正确下载。
• 检查屏幕接线。

5、SD卡出问题

• 树莓派无法开机也可能是因为SD卡出现问题（如接触不良），此时可以尝试重新插一下SD卡，或者更换SD卡刷系统重新开机。