The yum upgrade from 8.3 to 8.4 on my main machine looked as if it was working fine so I went to have a coffee. When I came back the screens were blank so I don't know what happened. On rebooting the screens are still blank. I have two graphics cards running three displays. I have a "rescue" system on the same machine that upgraded from 8.3 to 8.4 fine. The 3 screens work fine on this. I am not sure the upgrade completed properly. For example the new kernel: vmlinuz-4.18.0-305.3.1.el8.x86_64 was not present in /boot. Even worse, "yum upgrade" said there was nothing to do and would not install it. I installed the kernel package manually. /etc/redhat-release says CentOS Linux release 8.4.2105 My main question is: Where are the config files for the screen(s). This used to be something like /etc/X11/xorg.conf. Since I have a working rescue system my current plan is to compare/copy the config files. Suggestions please as to where I should start. It is difficult to work without a GUI. I have ssh access to the machine. Thanks Alan -- Alan McRae