I just installed yosemite zone on my external drive but for some reason when i try to boot for the first time from it. THE PROGRESS BAR DOESNT MOVE!

bassically when i installed and then restarted yosemite zone i then booted from the external drive i sa that screen with the 2 apple logos and i pressed enter on the external drive that had yosemite but the bar just hangs there!! When i tryied recovery HD The thing said debugger not configuring. Hanging.

i dont know how to fix this but please SOMEBODY HELP!!!