I was using KDE 4.13 (maybe not sure) on Centos 7, apparently without any problem while during last boot it doesn't appear the login gdm screen. It seems it is going to appear but in the end the system is stuck in the black screen with the lines that show what went fine or not.
I had a search and I tried this in a different
systemctl list-dependencies graphical.target
and found out I have gdm login manager. After I typed this:
systemctl status gdm.service
but everything seems OK. So I think the problem is different. I remember only now that after the last
yum update, every time I logged into mate (I used KDE only 4 days) a rectangular warning informed me that something went wrong with resolution screen. However, everything seemed working fine as usual.
I've noticed right now that I have a line saying to type
systemctl status rsyslog.service. I tried and it says that the "system logging service" is 'loaded' but not 'Active' (result: start-limit).
Is this the problem, perhaps?