Recently purchased iMac (Retna 5K, 27-inch) and using Yosemite. My old iMac was purchased in 2008. The old iMac had a firewire port on the back but the new iMac does not. This has resulted in me no longer being able to connect my Canon camcorder to the computer to upload vacation and family movies. While the Canon camera is 8 years old (it is a tape camcorder with ) is works perfectly and makes great movies. I had no problem with it at all using the 2008 computer - plug it in and go! I contacted Apple Care and they checked to see if the camera was still supported - it is. They told me I needed an adaptor to go from firewire to thunderbolt. Unfortunately, Apple did not have the adaptor I need, because the firewire my camera connection requires is a 3 pin instead of a 6 or 8 pin (I don't know what all that means, but Apple does not even make one to adapt the one I need with their computers). They sent me to another Computer store to get a second adaptor and told me to hook the two together and it would work. It did not work. I took it to the Apple store. They worked with me for an hour and gave up. They told me to upload the movie to my old computer and then copy it to a flash drive and then upload to the new computer using the flash drive. That was fine for the movie I had on the camcorder now, but I'm giving the old computer to my Niece so what can I do after I no longer had the old computer? Apple doesn't care! They just say I need to get a new camera! I think that is arrogant and very unfair to treat customers like that. Why do they change the computers and then not make all the adaptors necessary to use them? I don't want to spend hundreds of dollars getting another camcorder - I like the one I have. Someone recommended I sign up for a forum and perhaps another member will have some solutions to this problem. I will provide as much information on the iMac or the Camcorder as necessare to get this problem resolved. Thanks for any help you can provide.