This problem WILL appear if you use a recent Nvidia driver on MG-4 and just performed a command-line upgrade (online), AND your default video mode is runlevel 5 ("start X-Server on boot), AND your card is from the generations "Geforce 8xxx, 9xxx or "100 to 415". [ Gory detail: Your MG-4 system was using an NVidia driver named as version "346", although the new NVidia package for running these cards on MG-5 is named "340". Therefore, command-line upgrade via 'urpmi --auto-update' did not replace your old driver. ]
Solution:
Restart MG-5 in "safe mode". Enter the root password ("to continue..."). Then:
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# telinit 3 (enter runlevel 3 to activate networking)
# mcc (start the command-line version of Mageia Control Center)
Switch the Graphics Video driver to Xorg/Vesa.
Now restart MG-5 normally (Runlevel 5, not "Safe Mode"). You now have graphical desktop, although DPI is probably wrong, and you have no "effects".
Start MCC (graphical version). Go to Hardware - Manage Graphical Server.
Re-choose your NVidia card, and when it offers a checkbox to use the proprietary driver, click on "Yes".
You should see MCC install the '340' driver from the network. Restart normally, and everything should be working well.
