Hi guys

Have now successfully installed OSX on my external HDD ( i think).. I connect the HDD to the aTV and reboot holding down MINUS and MENU on the remote. aTV reboots and i get the apple at the grey screen with the grey "wheel" underneath it working. Just like it does when you start your macbook ot whatever. Now my TV is showing 720p and 60hz , after that, when it is supposed to go to my desktop and dock etc.. the TV shifts to 1080i and 50hz and is only showing me a black screen.. Anyone got a clue?