CentOS is connected to the monitor, leading to screen skew

CentOS is connected to the monitor, leading to screen skew

Today, when I was calling an old DELL CentOS6.5 server, I connected the monitor and found that the screen was completely skewed and I couldn't see the font clearly.

Solution: Change the display on the positive screen (usually available in IDC Rooms ).

I checked the information on the Internet, found several solutions, and posted the following:
For versions earlier than centos OS 6.5 or 6.5:
Go to the boot system installation interface of the optical drive system, and the following error occurs:
First, the server directly connects to the wide screen display, and the screen may be skewed;
Second, access the server to install the operating system through the remote control card, and the screen will appear out of the display range
Solution: do not select the default installation option
 
Installor upgrade an existing system install or upgrade the existing system
Option 2: install system with basic video driver
The problem is solved. You can also solve this problem by adding the "vga = 711" parameter during installation and startup.

For centos 7:
 
Solution:
Add the nomodeset parameter during installation and startup.
If the installation is complete, you can modify vi/etc/sysconfig/grub,
Add the nomodeset parameter: add the nomodeset parameter to the end of the line GRUB_CMDLINE_LINUX. For example:

Then run: grub2-mkconfig-o/boot/grub2/grub. cfg