How to access the GRUB interface in CentOS7?

To access the GRUB interface in CentOS 7, you need to hold down a key during the computer startup. Here are two common methods:

1. Press the Shift key: Hold down the Shift key when starting your computer until the GRUB screen appears.
2. Press the ESC key: When starting your computer, hold down the ESC key until you see the GRUB interface.

Please note that different computer brands and models may require different key combinations to enter the GRUB interface. If the above method does not work, it is recommended to consult the computer’s user manual or contact the manufacturer for the specific key to enter the GRUB interface.