SteamOS Installation Black Screen

I've been attempting to install SteamOS for a few days now and I've tried both methods and both of them have the same problem... 

I boot my from my usb drive using uefi and the options appear fine but then after selecting any option I get a black/blank screen.. I've left it for over an hour once but still no change..

Has anyone found a fix for this because I have searched all the forums and nothing but patronising comments and utter nonsense so I thought I'd come to the place I know there are intelligent and helpful people