After updating to linux 3.10 my GPU stopped working, it is a EVGA NVIDIA geforce 650. So I went about to purge nvidia and reinstall, did not work. The first time I installed it worked the flawlessly. This is what happens, when i go to "Additional Drivers" > Activate > NVIDIA binary Xorgdriver, kernal, module and VDPAU library, I get the following error:

Sorry installation of this driver failed. Please have a look at the log file for details: /var/log/jockey.log`. 

So I did the troubleshoot for that and still did not work.

Then, I went to the NVIDIA X Server Settings and got this error:

You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (just run 'nvidia-xconfi' as root)`

I did that and I get the usual New X config file written to 'etc/X11/xorg.conf. That still does not work. I purged nVidia again. I downloaded it again via nVidia's website and booted to CMD to do a manual install, but when it won't boot to CMD it is just a black screen and nothing shows up.

I am new to Ubuntu so please go easy on me, I have a bunch of CS projects I have to finish for school so time is of the essence. (I don't know if this will help but I had issues installing JDK, it still does not compile correctly as well as RSA and SSH and GIT. so I don't know if I screwed up big time on the Kernel update).