It's sound like an issue with the installation recognizing the video card. I looked around and found this posted, different computer but same video card from Người Điên Lang Thang on the cafelancer.com blog:
Step 1: Download driver from NVIDIA
website :
http://www.nvidia.com/Download/index5.aspx?lang=en-us
(Linux 64bit for my Dell)
Step 2: Disable nouveau on Ubuntu
(open source driver for NVIDIA Graphic
Card)
Press Ctr_Alt_T to open the shell command. sudo su – to gain a root
permission (nice trick :D )
Edit GRUB_CMDLINE_LINUX_DEFAULT variable on /etc/default/grub by
nano/vi or whatever editor you have.
Replace by :
GRUB_CMDLINE_LINUX_DEFAULT="nouveau.modeset=0
acpi_sleep=nonvs"
Save the file and Run “sudo update-grub”
Reboot your PC/lappy
Step 3: Install driver from NVIDIA:
After boot, your Ubuntu looks ugly now he he he he. Don’t worry! It’s
normal. Press Ctr_Alt_F1 to switch to
first text terminal.
Login by your account and sudo su – to get root permission
Run this command to stop the Graphic Interface service:
/etc/init.d/gdm stop
Chmod +x for driver from NVIDIA and Run. In my case:
/home/bntix/Downloads/NVIDIA-Linux-x86_64-270.41.06.run
Follow the instruction, then start the Graphic Interface service by :
/etc/init.d/gdm start
Then you will get back to a very nice Graphic Interface as before ;-)