I have same problem and power button is not working, new boot 1 and installes as ios. I read it's a official bug, http://bugs.hackmii.com/index.php?do=details&task_id=72.
Main reason to install is to make a backup of nand. now need to wait for beta 3 maybe.
Hi Wiipower
I like the fact you can load games from both dvd, sd and USB . But browsing games on USB is quit inconvinient now. Hope you can improve the user interface of Neogamma in the near future