I recently noticed my iMac lock screen does not actually secure anything as it's actually see thru at the edges. I can even read the text on the open windows below it. I did not expect this to happen on a nearly £3,000 iMac 5K..
Sometimes when watching movies i can still read the text in an open document underneath the movie.
Does this mean this expensive iMac screen is dying? Any way to fix this please? 😕
iMac, OS X El Capitan (10.11)
Image Persistence is not a new problem with certain type of displays.
Take a look a > Avoiding image persistence on Apple displays - Apple Support
From the pic you posted, I can't see anything except the screen's menubar. What you describe may be the transparency effect in macOS. Somewhere in System Preferences should be a checkbox to disable the effect but I don't remember which preference controls it.
I was not referring to image persistence. Rather to the transparency of foreground to background windows. For example, the Desktop image can "bleed thru" the foreground window a large amount or small amount or no amount. The foreground window will pick up colors from the background. But that may not be what you are experiencing. I would take it in for a diagnosis just to resolve it.
This image might give a better idea. My computer has been completely off all night so it can't be 'image persistance' or ghosting. I power on.. and when the log-in screen appears I can see right through it around the entire edge of the 27" screen. I can read text and see all the tabs open in Firefox, desptop icons etc..
This has only been happening the last month.
27" Imac 5k lock screen is see thru!
