OK, I missed the attachement, nice way
I don´t have experience with nvidia, but try `dmesg` to see the system log if there are details on why it failed. Maybe it´s related to the dri/dri2 modules missing, but I don´t have any clue why they aren´t there.
You can also try `equo match nvidia-drivers` to see what driver package version is available/installed for your kernel. If it isn´t installed for your kernel, install it via `sudo equo install nvidia-drivers`. This might happen after updating kernel to new version manually without updating the binary (ati, nvidia, ..) drivers to a version compiled against this kernel (and tagged with this kernel version in the entropy repo, in your case tagged with #2.6.34-sabayon)