Re: "(EE) NVIDIA(0): Failed to initialize the NVIDIA kernel module!" and /dev/nvidia
I too had this problem, and sat at a console typing furiously, editing, re-editing, and rere-editing again my XF86Config-4 file. That wasn't it. I don't know why, but reinstalling the driver package did the trick. I can't understand why it wouldn't be installed anymore (that statement is probably totally inaccurate, but it's the only conclusion I can reach) but after re-running the driver installation (using the extracted contents and running ./nvidia-install), it works again.