Hmm..sounds like that version of Ubuntu isn't getting along with some of your hardware, probably your graphics card. I'd suggest that if you have a broadband (say adsl) connection, try upgrading to the latest Dapper development version (it's almost ready, I've been using it long 32-bit and my friend 64-bit version and have seen no bigger problems than some translation-things on non-english installations).
Here's how you can do the job from the command line (press CTRL+ATL+1 for example, log in as root to make things faster):
Code:
cp /etc/apt/sources.list /etc/apt/sources.list_backup
nano -w /etc/apt/sources.list
if you don't have nano installed or wish to use some other text editor, simply change your favourite editor in place of that "nano -w" (red above); you could use "joe" or "vim" too. anyway, when the editor opens, there are lines describing where the packages are obtained; you should be fine simply by replacing every "breezy" with "dapper", like in the example below:
First, you have a line like this (not exactly like this, maybe):
deb
http://us.archive.ubuntu.com/ubuntu dapper main restricted
Then, you change it into this (only change the red part):
deb
http://us.archive.ubuntu.com/ubuntu dapper main restricted
And that's what you do to all lines that contain the word "breezy" - just put "dapper" in place of that. Then save the file (if you use nano then it's CTRL+O then CRTL+Q) and in the console run
Code:
apt-get update
apt-get dist-upgrade
you'll get a lot of updates now. just install them (apt-get WILL remove a whole lot of apps, but don't worry: you'll get newer ones instead) and reboot and see if that helped. if apt-get complains about the sources (that they don't exist or something), you can check out the sources file to see that there are correct sources there; it should contain at least the following lines:
deb
http://us.archive.ubuntu.com/ubuntu dapper main restricted
deb-src
http://us.archive.ubuntu.com/ubuntu dapper main restricted
deb
http://us.archive.ubuntu.com/ubuntu dapper-updates main restricted
deb-src
http://us.archive.ubuntu.com/ubuntu dapper-updates main restricted
deb
http://us.archive.ubuntu.com/ubuntu dapper universe
deb-src
http://us.archive.ubuntu.com/ubuntu dapper universe
deb
http://security.ubuntu.com/ubuntu dapper-security main restricted
deb-src
http://security.ubuntu.com/ubuntu dapper-security main restricted
deb
http://security.ubuntu.com/ubuntu dapper-security universe
deb-src
http://security.ubuntu.com/ubuntu dapper-security universe
deb
http://archive.ubuntu.com/ubuntu dapper multiverse
deb-src
http://archive.ubuntu.com/ubuntu dapper multiverse
I hope you get your display working