Ok, so I have a projector set up in a classroom. The HDMI cord that we have there will only work with a PC and not any of our Macs. We have tested with different Macs and see the same issue. The Mac recognizes the projector but the projector fails to recognize the Mac. When we switch out the cord the projector works with the Macs just fine. -- Has anyone seen issues like this? I'm assuming the cord is bad but it strikes me as odd that the cord would still work just fine for the teachers with PCs. I want to verify that it's just an oddity prior to purchasing a new cable.