Re: 304.64 Driver & GeForce 6600; Black Boot up!
I had the exact same issues until I uninstalled all the X drivers AND the kernel modules for the nouveu driver. DKMS modules from the Nouveu driver were still loading, causing the blank screen.
I went into my package manager and uninstalled all the drivers and DKMS module files for nouveu, then ran the NVidia install script. That built the DKMS module and the driver.
Some distros will force the nouveu driver by default and not allow you to install the nv of nvidia driver. deleting/removing those file forces it to work.
If you get a "no screens found," that is OK and the system will usually work fine after a reboot to reload the kernel module.
Hope that helps!