After having installed Ubuntu without Internet conecction, I restart the PC, go to BIOS, change boot priority to internal harddrive, save and exit. Then the PC starts again but the screen gets orange with vertical stripes and stays like that. I tried both versions 64 bit and 32 bit 12.04. I can't use internet before having Ubuntu, because y have to make a network configuration(this is not allowed in the trial version before the installed version).
I have just installed the 32 bits version but happened exactly like you, start Ubuntu in recovery mode from grub, there start session in low graphics mode (I don't remember the name exactly) and install the graphic drivers, that solved my problem for now, if not, do it from a terminal, from recovery mode too, it may work to you.
Curiously, I think Ubuntu works behind that screen, because I wrote the
sudo shutdown now in a terminal, without being able to see it, and worked. Of course, I knew all the steps from memory, if not, it would have been impossible.
Are you sure that it is Ubuntu that is making this problem? Do you see the screen getting orange before (meaning you can't see BIOS/Grub/Ubuntu Boot), during, or after BIOS/Grub/Ubuntu boot?
Try running the PC with an external monitor and see if you get the same result displaying on the monitor. It could very well be that coincidentally your computer's screen messed up around the same time of your Ubuntu installation?
I don't know that much, just giving you some ideas.