I got the Kanex XD a while ago to connect my PS3 to display on my iMac. It used to work fine, but now when I have tried it again it's stopped working altogether. (Yes, I have forced it to stay on 720p from a TV before connecting to my iMac.) Other than typical updates with the OS I haven't made any major changes to the iMac. Here's the setup: iMac (27-inch, Mid 2010) 2.93 GHz Intel Core i7 8 GB 1333 MHz DDR3 ATI Radeon HD 5750 1024 MB Any suggestions?