This does appear to be a kernel issue. I was able to force my Optiplex 960 by hitting the power button and hitting the keyboard (no joke). I found this in reference to the kernel, http://bugzilla.kernel.org/show_bug.cgi?id=12520 If you downgrade to 2.6.27 the bug is not there, but you lose the network driver support.
** Bug watch added: Linux Kernel Bug Tracker #12520 http://bugzilla.kernel.org/show_bug.cgi?id=12520 -- Ubuntu Jauntyalpha 3 does not boot from Live CD https://bugs.launchpad.net/bugs/325121 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
