Fedora 27 falls into an unresponsive black screen after signing in GDM after installing akmod-nvidia-340xx...

Hi there, After following the steps described tfor installing akmod-nvidia-340xx... https://rpmfusion.org/Howto/NVIDIA#Legacy_GeForce_8.2F9.2F200 My system fall into a unresponsive black screen... After this a relize of this other topic. https://rpmfusion.org/Howto/NVIDIA#Wayland I did whats i mentioned but nothing... in this case i got into a unresponsive cursor screen. Any help would be appreciated. Regards.