Root Device UUID Error while installing Mountain Lion on VirtualBox 4.3
I ran into this problem recently while attempting to install a Mountain Lion VM on my Mac Pro (10.10) using VirtualBox 4.3.2.  I was trying to follow the instructions here, but I got stuck in the EFI boot sequence.  I attached a screenshot, but I think its where you got stuck too.



I tried the same process on my macbook pro laptop (with the same iso), and it worked fine.

I fiddled with it for a while and found a solution.  If you follow those same instructions, but before you start the VM remove everything except CD/DVD from the boot order, it properly boots to the installer and you can continue with the process.

Forgive VM name typo


Make sure you restore the boot order before it restarts.