I was thinking about this, as I'm looking to go more legit than the hackintosh I put together for my desktop machine, as well as the MBA that I have. The only thing really keeping me tied to anything with a PC is flightsimming and realtime ATC over a network, and because of that, I prefer to use a second monitor when I use my PC. However, lately I have had this penchant for decluttering, and am looking to get rid of a lot of my hardware (I dropped my two ATX Mid-towers that were running Linux and Windows for 2 miniITX builds running Mountain Lion and Windows, though that still leaves me with 2 boxes on my desk). Wile I love the Hackintosh, I'm also growing tired of rolling my own builds (that's so 1990s/2000s), to where I want easy and simple to maintain. So I'm thinking iMac now. Business there, simming on the PC. But that still leaves the problem of the 2nd monitor, as I don't want 3 monitors on my desk. Looking at the specs of the iMac, I noticed that while it has a discrete video card, it also has a miniDisplay port. My question: Would it be possible to connect a MiniDisplay cable between a high powered card (say, an AMD Radeon HD 6950) and the back of an iMac to use the iMac as a second monitor? I would assume you could, but that is without knowing how it would switch between the discrete display and the miniDisplay port. So would this be possible? BL.