I followed the somewhat confusing instructions I found here (Mac OS X running on Apple TV) in order to try to install OSX on my old (White) ATV. I was able to remove the drive and was able to install OSX on it, but got stuck at that point.
I installed OSX on the "Media" partition, since the "OSBoot" partition didn't have any storage space for the OSX install (Hope this is correct?)
I'm new to this type of hacking and while I think I think I replaced the mach_kernel and the boot.efi files correctly, when I tried to run "bless" , I got a Terminal message as follows "Authorization required".
From here, I am stuck. When I connect the ATV to my monitor, the ATV boots the ATV OS and NOT OSX.
Any help would be appreciated.