New experiments: 1. installation leap15.5 using openSUSE-Leap-15.5-DVD-x86_64-Build484.1-Media.iso no online Repositories xfce as windowmanager is works fine, no crash. I need Tcl/Tk 2. installation leap15.5 (the same ISO ) include online Repositories choice: C++ , Tcl/Tk xfce as windowmanager the old Home-Partition is mounted, my home is prepared whit any Tcl/Tk-tools any programs will be started by xfce-autostart. The displaymanager shows the User. After "Password" + Enter -> "green screen" - dead only power off or reset possible Before login-try (known user), i can start a console (<ctrl><alt><F1>) and create a new user-account (minimal, no autostart-programms. The system crash , independent from user-login. On the Displaymanager the are possible to select icewm or xfce. Is icewm is selected login is possible, select xfce -> crash. My be, the bad package will be taken from a online repository