After the boot loader completes the screen goes to the following image !
My VGA : xfx geforce 9600 gso 1.5g
What should I do ?
I reinstalled 11.10 , 11.04 and 12.04 but I have my problem yet ! Another point is that I install ubuntu file system in another partition . Maybe Some Wrong config file is still in my home folder .
In my opinion it's not about driver problem because I have 11.10 with driver without any problem and I think this problem occurs when I try ubuntu 10.04 live CD !
I try ubuntu 12.04 final release too ! and the same problem occurred !
Try booting up using the "recovery mode" option. Then get the official drivers from http://www.nvidia.com/Download/index.aspx?lang=en-us (It's the GeForce 500 drivers)
Check out the comment to my answer here: Upgrade of nvidia graphics adapter fails on Lucid Lynx, low resolution only, no driver?
He points to a good page about how to get the drivers working
If you have to you can install the lynx text browser to navigate to those places. It's not fancy, but it gets the job done in a terminal. If this doesn't work try making a new partition and install it on that partition. If that doesn't work download ubuntu 11.10 again and install it from that.
I reinstall ubuntu 12.04 but this time there is no need to install the nvidia driver . so nothing wrong happens . Thanks for your helps !