Hello, I'm a professional photographer and videographer, I give an intense use to the computer, using Final Cut Pro and Lightroom / Photoshop. I have a 2012 27" iMac (i7 3'4Ghz, NVIDIA GeForce GTX 675MX 512Mb). Yesterday out of a sudden the screen became black and full of moving lines, leaving the computer impossible to work with. The Apple Care program expired last year. I went to the Apple dealer and she told me that the problem is the graphics card and changing it would cost me €550 ($650). She recommended me to buy a new iMac of 2017 generation, told me that next year my actual iMac will become "vintage" and won't be able to repare it anymore, and that with the use I give it won't last longer tan 2 years more. She also told me that the lowest version of the new iMac generation is more powerful than the one I have and should be fine with it. What would you recommend me to do? Repair it? Buy a new one? In that case, which one? Thanks a lot for your feedback.