I am messing with a new Acer Computer and Ubuntu 9.04.

The computer is an Acer Aspire 7530G laptop with AMD Turion X2 dual core
mobile Rm-70 2.00 Ghz.

When I installed Ubuntu it didn't want to recognize the computer monitor
except at dead slow refresh rates, until I went and got an Acer driver.

I loaded the recommended driver and the refresh rate was much better,
but I gave up being able to select the "normal" screen resolution.

So I downloaded another driver......and forgot to turn off the first
proprietary driver before shutting down the computer.

Quite logically my computer has no idea how to start up, and so it
freezes with a dark screen and a thin white fuzzy band across the full
width of the screen.

Of course no matter what I try, I can't get the computer any further
than the bios screen without freezing the monitor.

On an old macintosh computer, I used to be able to hit a key to select
startup from the CD, but that isn't a possibility with Ubuntu.

If I had selected a startup disk before shutting down, I would have been
OK.....of course I didn't do that.

Is there any way to correct my error from the terminal available in the
bios window?