I have a desktop machine with 11.04. It has ATI/Radeon graphics:

john@john:~$ lspci | grep VGA

01:05.0 VGA compatible controller: ATI Technologies Inc RS880 [Radeon HD 4250]

I was attempting to run some programs on Wine on it. It suggested using the proprietary driver if a had problems, which I did. I opened "Additional Drivers" and there it was: the FGLRX driver just waiting to be installed. I hit "Activate" and it installed, prompting me to reboot to complete the upgrade. I closed the window, opened the shutdown menu, and hit "Reboot to complete upgrade".

When it came back, it ran a disk check and froze on the purple screen with the word Ubuntu and the 5 dots. After about 15 minutes, I rebooted it. Same story. Thinking it was a fluke, I rebooted once more. This time, nothing. Zilch. Nada. I don't even see the BIOS. My monitor insists that there is no video coming from the computer. At all.

I've installed this driver before on an identical machine with no trouble at all.

I'm aware of this question, but that asker gets a black screen, I get no screen at all. I'm fairly sure I could fix this if I could just make it to a terminal, but no amount of keypresses (CTRL + ALT + F1, ALT + F2, holding SHIFT during boot) brought me anything.

What can I do?