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All replies
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Helpful answers
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Aug 31, 2014 12:46 PM in response to Foreverred1by den.thed,Have a look at > Avoiding image persistence on Apple LCD displays
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Aug 31, 2014 3:07 PM in response to Foreverred1by Klaus1,Image persistance on Apple displays:
http://support.apple.com/kb/HT5455
Apple say this about LCD screen burn in:
http://support.apple.com/kb/HT2807
which includes suggestions for curing that effect.
Alternatively:
How to fix screen burn and/or stuck pixels on an LCD monitor:
JScreenFix
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Oct 18, 2014 4:19 AM in response to Klaus1by Schpil,Hey!
I've had the same problem (image persistence) on my iMac 27'' (late 2013).
I had to have my display changed through Apple Care a few days ago. The thing took 30 minutes.
Apparently they solved the problem on later models.
If your iMac is still guaranteed I would strongly suggest that you have it serviced (whether you have Apple Care or not). It is not a software problem that you can solve using the white screensaver!
It is a hardware problem.
Hope this helps!