Originally Posted by
PandorasBox
I could only install NVIDIA drivers not in the repository by booting to the prompt and not the GUI and any incorrect entries in the config files would cause the system to hang when starting X, I found that using old NVIDIA options from previous versions in the latest config files would do this, then I had to restart in recovery mode and change the configs back to what they used to be.
If I was you guys I would backup the previous version's directories before installing or changing anything then do a file compare to see what changes were made to your config files look for options statements that are invalid for the version you are using.