Did you try to boot without 'quiet' and 'splash' options (hit F6 I think it is, for more boot options, and just remove them). I had to boot with 'acpi=off' as well for my computer not to hang (but it still didn't detect my USB stuff correctly, I'll file a separate issue about that).
-k -- Boot locks at black screen with last few amd64 kernels. https://launchpad.net/bugs/59272 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
