screen blinks on and off when I boot into the live cd

[cb50]

My system is as follows:
core 2 duo e8400
powercolor ati radeon 4830 graphics
4 gb kingston pc2-6400 800 mhz ram
gigabyte ep45-ud3r motherboard
750 gb western digital hd

When I attempt to boot my computer using the ubuntu 10.04 64 bit live cd the screen lights up briefly about every 2 seconds before blinking off again. The ubuntu booting process is shown just long enough for me to see that it appears to be working besides this display issue. I also had this issue attempting to install kubuntu 10.04. My system currently runs opensuse 11.2, but before that it had mint linux 8 and an older version of ubuntu which both worked fine. Has anyone else experienced this? Any ideas or is ubuntu on my computer a lost cause? Thanks in advance

[Rubi1200]

Take a look here:

http://ubuntu-tutorials.com/2010/05/06/ubuntu-10-04-lucid-blank-screen-at-startup-workaround/

You will want to try the xforcevesa option.

Hope this helps.

[cb50]

thanks. xforcevesa didn't work but for some reason nomodeset did. go figure