Thought I'd share this in case anyone is interested.. Got my MB working with the older 27" display port cinema monitor. It's hooked up to a USB to Display port adaptor. http://www.amazon.co.uk/gp/product/B00NI96S2O?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00 then a display port to female adaptor. http://www.amazon.co.uk/gp/product/B003N3DTKY?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00 The USB adaptor is plugged into a Dell 2715H monitor's USB hub (which is USB 3). The display is a little bit laggy, but fine what I do. I have a video of it, which is badly done but gives you an idea.. On the left is the Dell monitor, on the right is the Apple cinema display. For some reason the video looks fine on my phone, but lots of artefacts appearing now its hosted on Vimeo? Sorry about that, I've no idea why.. Works on 10.10.4 and 10.11 b3 The speakers work but no iSight camera nor do the brightness keys on the wireless keyboard work - i.e. the brightness of the Apple screen is fixed.. I'm sure theres and app to sort the brightness out, but I'm 90% of the way there Hope it helps someone?