Resposta para "Bottom of screen dimmer than top of screen"We have a 2007 24” iMac (upgraded to El Capitan) that was having some screen issues. We inadvertently did a screen share with our new 2018 MacBook Air (as were trying to watch Disney movies using the big screen) and ended up finding that the MacBook Air adjusted the resolution on the iMac automatically and formatted a new screen on our old iMac that is much clearer, seemingly doing away with any of the LED diminishing problems. It’s like we replaced the screen but even better because it’s now configured to the higher HD screen resolution. Wow, lucked out. Try it and you will be amazed at the results. (And by the way we were not successful in using the larger screen to mirror because of privacy issues with Disney and Apple TV.) But was worth the effort for what we got!