There really isn't enough information provided here to know what might be going wrong. However from the description so far it sounds like it's failing at initializing the kernel drm driver, or getting stuck during early parts of the boot prior to X.
If you can get some additional diagnostics such as dmesg from the failed boot, that might clue the kernel guys in on what might be going wrong. In that case please reopen the bug. ** Package changed: xserver-xorg-video-ati (Ubuntu) => linux (Ubuntu) ** Changed in: linux (Ubuntu) Status: Incomplete => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/763909 Title: 11.04 Wont Boot With Mobility Radeon HD 3400 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs