Runlevel 1 - Ctrl + Alt + F1 - No Console - Black Screen

Hello,

I’ve installted suse on a MSI-Notebook.
GTX980M, Intel 6700HQ.
Without a display-manager i get a black screen.
In any case: switching runlevels or stop the display-manager or boot directly to console.
I can’t explain why.
It wasn’t an issue earlier, but than deinstalled and reinstalled suse a few times(because of other issues) and now i can’t open a console.
I tried it with Gnome and KDE.

Do you have any ideas?

Thank you!