I've noticed something strange and was wondering if anyone might have clues as to what is going on.  I have a Lenovo ideapad with a radeon chipset.  Everything appeared fine with F23 - but 
when I upgraded to F24 I started having issues getting a blank screen instead of the KDE login prompt screen from SDDM.

If I boot into single user mode, and then issue an init 5 command, everything works fine.

Any idea as to what this might be?  I would think if it were a display driver problem the init 5 wouldn't work either.

So to recap:  Normal boot - blank screen
Single user mode, followed by init 5 - everything works.