Timothy Murphy wrote:
When I re-booted my HP MicroServer into CentOS-7.2 I was given a text console.
I found the solution in the end, I think from a hint dropped by Johnny Hughes.
I was missing a number of KDE packages, I'm not sure why. But when I ran "sudo yum install kde-workspace" there were a couple of dependency conflicts. I managed to overcome these by yum-removing 2 packages, and then re-installing kde-workspace filled the gaps. As a precaution, I ran "sudo yum distro-sync" which for some reason downgraded a dozen packages. After that I re-booted into CentOS-7.2 and was given the desired graphic console.
I think I probably overlooked an error message that came up when I updated the system remotely. (The server was in another country.)
Thanks for all the suggestions I received.