I'm only getting a text console with CentOS-7.2 on my (oldish) HP MicroServer.
The only explicit error I see in Xorg.0.log is that no driver is found for my Pixart USB optical mouse.
My query is: would that be sufficient to prevent a graphic console?
Incidentally, I can use X apps, eg xpdf, if I ssh in from my laptop.
As always, any advice gratefully received.