I not too long ago revived my early 2008 Mac Professional 3,1 together with my 30′ Cinema Show and my 22′ Cinema show. I attempted plugging within the two screens into their respective feminine DVI ports on the Mac professional, however just one monitor is acknowledged. I switched the plugs round, and whichever monitor is plugged into the rightmost port works, whereas the opposite stays black and unrecognized. Why is that this? Is there an adapter I would like to ensure that each to work? Thanks!