I get an error when I select the disk to install it on. It shows a yellow triangle and when I click the disk it says it can not install because this disk can not be used to startup this computer. I have the disk portioned OSX on one side, Ubuntu on the other and use rEFit to boot, so I thought rEFit was the problem and removed it and still can't install. So i deleted my Ubuntu and reformatted it, still will not install. I keep getting the error, this disk can not be used to startup this computer. I when to startup and made sure it was selected as the startup disk and it is, but it still will not let me install. Any ideas? Also how can I re-combine those two partitions without loosing anything? I don't have an extra drive right now to backup to, so I cant just erase and start fresh.