Just a quick note for those wondering;
YES YOU CAN! Use a 27″ iMac in Target Display Mode with a non-Apple device on the other end of the cable!
The 27″ iMac (last sold in 2010) can be used as DisplayPort monitor. This is important!; the 24″ iMacs that came after the 27″ also have a Target Display Mode, but they require a ThunderBolt connection, as opposed to a Mini-DisplayPort connection.
(Source: https://support.apple.com/en-us/HT204592) Continue reading “Adding more purpose to your iMac 27″, use it as monitor for any HDMI device, like your xbox, PS4, media player, set top box, etc. etc. etc.”