Okay, so we called Mac support (and the nice lady told us to call Apple support Sweden, not Norway, it's free there), and they told us that it was, indeed, a kernal panic (or at least they think so).
It's still under warranty for repair, so my friend will send it there.
Thanks a lot for all help! Much appreciated.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS