i686 got past TPM, but now video problem

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In F23, all went fine, but in F24, some video problems are 
showing up.

After the grub menu, the machine is supposed to switch to the 
framebuffer and the boot image (fedora infinity goes from 
white to filled in) appears and one can switch to the boot 
message display with ESC.

Well, not in F24 :-( Now, it appears that the framebuffer 
never gets started (is that Pkymouth?). Instead, the boot 
messages scroll past, in large font, not small like normal 
under the framebuffer, and then it suddenly switches to a 
blank display with a wide progress bar at the bottom, 
starting with white, I think, then, as it moves across the 
screen to the right, it changes to light blue, and finally 
dark blue.

Next, the screen flashes some and artifacts appear, with 
coloured boxes and things (mode-setting?) and then the GDM 
prompt appears, as expected. I click on my user name and the 
password field opens and I can select either Gnome or KDE.

When I select Gnome, there is more mode-switching and 
artifacts and a black screen, then the desktop appears.

When I select KDE, there is a lot of screen flashing (mode-
setting?) and artifacts covering half of the screen, then the 
starfield background image appears and the KDE logo with the 
progress bar. It is all very jerky, not smooth, like in F23. 
Once the progress bar reaches the right, the screen fades, by 
stutters, to black and the Plasma setup menu (the square in 
the upper left corner with the 3 bars) appears momentarily, 
before the screen blacks out completely, leaving only the 
functioning mouse pointer visible. Nothing happens :-(

ctrl-alt-del is the only thing I have been able to 
successfully do. This brings up the logout screen, which 
appears in stutters and very slowly, only the top portion of 
the rectangle, then the rest, etc. I successfully log out and 
GDM reappears, with more mode-switching and I am able to log 
in to Gnome.

There is a whole lot of 'mode-switching' from the grub menu 
to the appearance of the desktop.

I suspect that, for some reason, the framebuffer never gets 
started right from where grub gives the boot process over to 
Plymouth and then it's set all wrong.

Is there a way I can tell the computer to boot in the proper 
mode right at the grub prompt, or even set it permanently?

My suspicion is that, when I installed from the live CD, I 
had trouble with the graphical mode, so I had to select the 
graphics lite from the troubleshooting screen and somehow 
this setting has been made permanent.

I want to get it back to how it was set when I used F23. Is 
this possible? Or have there been some major graphical 
changes in F24 that have finally obsoleted my aging machine 
(I don't think so, actually)?
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