Problem = Not Solved Yet.
I think you should see if your video cards are working.
Hang with me on this one; it might get a bit complex.STEP ONE
Cut and paste the following command into your terminal program (the $ prompt):
sudo apt-get update && sudo apt-get -y --install-recommends upgrade dist-upgrade && sudo apt-get -y --install-recommends arandr
sudo (lit. "superuser do") allows you to access "root" (the administrator account) for your system without having to login to root manually. Enter your system password when prompted. You will only have to enter your password once; sudo remembers your password for a certain amount of time.
This command batch will do the following:
1) check to see if there are any updates to the kernel and system packages
2) download and install these packages
3) install a program called arandr, which is a graphical interface to a command-line system called arandr (more anon).
I can dissect what all the commands mean, if you want. Or you can just plug in the command.
This process might take up to a half-hour or more, depending on whether you upgraded your system upon ubuntu installation.
Now you have two diagnostic options: arandr, which is a graphical video diagnostic tool, and xrandr its command-line sibling.
If successful, you will be returned to $. Type 'xrandr'
You will get a list like this (this is from the laptop I'm using right now):
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192
LVDS connected 1366x768+0+0 (normal left inverted right x axis y axis) 345mm x 194mm
VGA-0 disconnected (normal left inverted right x axis y axis)
LVDS is the video system for most laptops. VGA is for an external monitor.
1366x768 is the screen resolution
60.0 (Hz) is the screen refesh frequency.
+ means that this is your monitor's current settings
Most monitors will turn off above 60 Hz to protect the lcd display. Old picture-tube monitors would actually burn out above 60 Hz! DO NOT run any monitor at a resolution greater than 60 Hz!
Follow these steps first, cut and paste results, and then we'll proceed to more in-depth diagnostics.