Try removing nouveau (you don't need it installed if you're going to use the Nvidia blob anyway) and boot in runlevel 3 (no X). You can do it from the command line: enter grub and just edit the kernel line and put "3" behind it. Be sure to load your new kernel (34).
Purge the Nvidia drivers and reinstall them completely. Generate an xorg.conf with nvidia-xconfig and move it from /etc to /etc/X11.
Reboot normally and your login manager should appear, with the loaded Nvidia module.