[CentOS] CentOS 7.5 gui login root only

Prasad K writes:
> I have seen similar issues when user shell profiles like .bash_profile or
> .bashrc has some errors.
> Are users invoking other shells from their default shell ? this usually
> breaks X11 start-up scripts.
 
The same user can login find through the gui when the system was installed with the CentOS DVD directly. Package selection was the last option (create workstation or something) with most but not all extra package groups that are selectable at this point.

This is a KVM machine, I have tried the default (cirrus) and vga, no change.