What should I do if centos cannot be started after installing CentOS from a USB flash drive?

Cause analysis:

When installing the system, grub is installed on your U disk by default. Therefore, when you turn on the computer and do not insert the U disk, the system is Unable to boot into the system through grub.

The solution is as follows:

1. Switch to the root user

#su -

2. Enter grub mode

#grub

3. Find the boot media

grub>find /grub/stage1

or

find /boot/grub/stage1

will generally return something similar to (hd0,0)

grub>quit

4. Edit grub.conf

#vim /boot/grub/grub.conf

and copy the file Replace all occurrences of (hdx, y) in with the values ​​obtained in the third step.

5. Re-enter grub mode and perform the following steps

grub>root (hdx,y)
grub>setup (hdx)
grub>quit

6. Restart

#reboot

Recommended tutorial: centos tutorial

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