I have a brand new Dell R610 Server and want to install Centos 7 on it instead of RedHat. The problem I currently have is that when I get to the point where the Open Manager asks to insert the RedHat DVD, I insert the Centos DVD #1 and after a minute or less, it ejects it.
Basically I performed the following steps.
1. Downloaded Centos 7 x86_64 iso files. 2 of them)