Boot problems liveCD
The problem is that you created a liveCD which works under Parallels for example, but your Intel Mac won't boot from it natively. You have rEFIt installed and those liveCDs do not show up either in rEFIt or when you hold down "option" as the Mac boots. You checked md5 and you are sure that it should boot.
The problem is that sometimes you have to get back into OSX to set the startup disc to be the liveCD.