THE STORY, FOR CONTEXT So.. here's my sad sob story. I, a supposedly technologically savvy human, have never taken a computer in to get fixed. I fix things myself. In this case it was a hard drive on an iMac 5k late 2014 model I bought my wife one Christmas (upgraded 4.0GHz with a 295x GPU and 1TB and tons of memory). I dutifully ordered a new hard drive including the special screen adhesive strips you need to replace the screen with. Very carefully, I disassembled the iMac and replaced the hard drive. Replaced the screen using the special adhesive strips. Eureka! It works. Cost me less than $100 and I was back up and running again. Feeling very proud of my work, I sent my wife's workstation up again and she was back in the game. HOWEVER... about a week later, with friends visiting the house, I heard a crash and my son comes into the room declaring: "The computer's screen just fell off!!!" The slight downward tilt on the wall mounted iMac apparently caused it to "unstick" and fall off the computer to the desk. To my horror the screen was shattered. Undeterred, I went to eBay to order a new screen. $300. Delivered within 72 hours. I plugged the screen in and... nothing! The eBay store guy offered to send me a new cable in case it was the cable. No luck. It appears that, upon falling out of the enclosure, the screen pulled very hard on the socket and it was damaged somehow. Close inspection shows that the socket seems to have some minor damage. ARRGG!! I go to my local Apple authorized retailer and he tells me, probably need to order a new motherboard. I look on eBay. Only one I could find for my model was $950. Too high for my taste, having already spent about $400 on this computer. Could have bought a new one! Now, 10 months later, my main computer, a MacPro 2,1 which I have nursed for at least 13 years (including hacking it regularly to run the latest OS thanks to Pikify on this forum) finally dies. I now have two broken Macs. One newer than the other. I HAVE to get the iMac back up and running. I absolutely must. But I am at a loss. Please help me oh Mac gurus. In summary: The iMac works if I plug it into an external monitor, though it seems to shut down after a while. it seems to work headless via Wifi and screen sharing (no shutting down). I have a brand new screen in a box but it won't light up when plugged in. The old screen that is shattered won't light up either. I've tried different ribbon cables, with no result. The model is iMac 5K, late 2014, BTO option, 4.0Ghz with the M295x GPU https://everymac.com/systems/apple/...-inch-aluminum-retina-5k-late-2014-specs.html but with the 295x GPU SO... MY QUESTIONS TO THOSE WHO ARE MORE ENLIGHTENED THAN ME: I've waited probably about a year now to find a motherboard that is cheaper. So far, I can't find much, but I've seen similar iMac models that have damaged screens on eBay, but otherwise ok. Some are not exactly the same year, some are not the same CPU /GPU combo. There are also motherboards without CPUs for a lot cheaper, but I'm worried about ordering something that might not work. So... the questions: Do I have to install exactly the same motherboard as the original model? Or can I install a newer motherboard? Will my current CPU / GPU be compatible with other motherboards? I found this motherboard on eBay. Will it work for my situation? It has no CPU or heatsink etc. I found this screen damaged iMac 5k, same BTO model on eBay. Would I be able to swap out my new screen on this one and have the same functioning model? Or I could swap the motherboard with my iMac. etc. I found this iMac which is being sold for parts, similar to mine, only lower GPU speed (3.5GhZ). Could I pilfer it for parts and make my iMac whole again? Would I be able to use my faster CPU and faster GPU on the motherboard? Does anyone have some recommendation for me to resolve my dilemma without being out another $900? Point me in the right direction and I will forever be indebted to you and will pass along the Mac karma by helping some other unfortunate soul one day. Also, if you live in San Diego, I will buy you a beer. I THANK YOU GUYS (AND GALS) PROFUSELY, if you can help me solve this dilemma. It is heartbreaking to go through something like this and have what seems to be a perfectly good computer sitting in the corner.