Chosen Solution
When I upgraded my iMac HDD Fusion to SSD and NVRam SSD, when I replaced the screen, I have a single green line down my screen to the right. I was EXTREMELY CAREFUL with the screen when pulling off the old adhesive and reattaching and there is no damage to the screen, so I have no idea how or why this line appeared. Could it be a software glitch and is there a way to fix it? I can deal with it but it is VERY annoying!
You have a LCD TAB error which is caused by either physical damage or a defect in manufacturing. In this case I fear you inserted your tools a bit to far in, hitting the display panel ribbon cables.
Did you follow this guide to the letter and use the proper tools? iMac 27" 2017 Display Replacement
