Loginscreen doesn't appear

Hi,

I installed rockylinux xfce 8 the first time, on two laptops. Installation worked fine. But on both laptops-having installed something (on each one something different, why I don’t mention it), after the reboot only a black screen with a working Mouseindicater shows up. No Loginscreen.

Questions:

  1. What do here to fix the issue?
  2. And how do I login over the root shell?

best wishes

Tasso