I guess the screen is called Plymouth,  and it has started to receive no inputs since this morning and I cannot enter my password to enter the system. Restarting and shutting down did not help.  My distro is Fedora 24 and the default desktop is Plasma. As you see in the image, tge cursor is like a cross. And this is another picture of the boot screen before Plymouth appears.
my login screen does not get any input and I cannot enter my system
fedora;kde;login;plymouth