The screen of my IMac 27" seems to have lost some brightness from the bottom left corner ?

Anyone experimented this kind of problem ?

No, this is a sign of the screen defects. The screen will flicker, sometimes looks just fine, other times a dark area appears in the lower left quadrant. It may come and go. Having been through this myself I'm a bit familiar with the issue. There have been temporary fixes. But they all require disassembly. Doing so on your own voids any warranty. If you take it to an Apple shop for any future repairs, once they see you've been inside they will refuse to service the computer. This is not a problem resulting from loose screws. If you try to fix the problem yourself, then you are the one with the loose screws. I went down that path, and what was an expensive repair I tried to avoid became an even more expensive repair after Apple refused me service. And, that was when they still had a screen replacement program in place. Don't become a member of my club.

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