Hello there,
I just made the update to 11.04 and i have the same problem
Here is a brief explanation of the steps that occur during the boot, as i 
noticed above these were not clearly mentioned ..

I have a dual boot setup alongside with windows 7 so at the dual boot
screen, choosing ubuntu usually displayed a black screen with the boot
options, which after the update is purple (and font size is smaller, not
sure if that's also a bug or on purpose)

After choosing the latest Generic, the boot will show up some boot text quickly 
and then get to the splash screen
Immediately after the 4'th "dot" appears on the loading screen, my display 
would go to black, then turn on again, then back ... indefinitely 
In other words, the display dims over and over.... 

I did not reach the login screen yet and i have no option of stopping
the loop other than Ctrl + Alt + Delete (Escape used to work before when
i had a similar situation)

In my next attempt, i tried going to the recovery mode to check for
errors, did not get anything, and when i chose the resume option, i
experience the same thing as above


I am fairly new to ubuntu and i don't know what to do besides that.. If there 
is anything i can do to help, please let me know, i am usually online most of 
the day  :)

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https://bugs.launchpad.net/bugs/763909

Title:
  11.04 Wont Boot With Mobility Radeon HD 3400

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