I normally shut down the family Ubuntu 11.04 pc rather than hibernate, but my daughter didn't realise that and put the machine into hiberate. Now when we turn it back on, I see the POST output from the machine's BIOS, then the monitor just displays "input signal out of range" and we can't do interact with anything. This state has survived several power-off cycles, so I presume that the OS is keeping the hibernated session state somewhere, and because I haven't successfully managed to boot the pc it's still there.
I'm currently running the machine from a live CD, so I can eliminate hardware failure as a problem. This means I can also make changes to the on-disk installation, but I'm not sure where to look. Where would Ubuntu store the hibernated session? Can I just delete that file? Any other suggestions as to how I can, er, restore normality? :) As a last resort I can re-install 11.04, but I'd like to fix, or at least understand, the problem before I do that.