Hmm, unfortunately I have no experience with NVIDIA hardware under Linux :/Fenek Alfa wrote:
(been away, finally got some time to do it)
So I have a Gigabyte GeForce GTX 650, and no matter whether I downloaded the drivers from Nvida's site or through "Additional Drivers", both of them caused my pc to turn on only with console. I got it working again in both cases(by "sudo apt-get remove --purge nvidia* " and then "sudo start lightdm" and rebooting, I heard that's the first thing to do when a Nvidia driver install related fail happens), although now my cursor sometimes disappears.
I don't know how well nouveau suports your card, but here's a pretty up-to-date PPA for graphics drivers that might help. Might also recommend updating your kernel as well to the latest you're comfortable with (there's 3.12 nightlies, 3.12rc2, and 3.11.1 currently; raring by default comes with 3.8). Newer kernels tend to have some open-source driver improvements.
Another option to try is to use a Desktop Environment that doesn't require 3D acceleration (Unity on Ubuntu I believe since 12.10 requires 3D acceleration, either via hardware or llvmpipe). Not sure if this would be helpful to a computer that doesn't seem to start lightdm though at all...