problem with ubuntu booting up

[spartan228]

Hi, Ive just installed Ubuntu on my computer and set up GRUB but every time I try to get on ubuntu it loads up most of the modules but then the screen changes to a rainbow of colors on the screen and it seems like computer freezes, can someone help me

 

[Bahawolf1]

Try following the advice at this thread:
http://ubuntuforums.org/showthread.php?t=102037&highlight=rainbow