Anyone who went out and bought the new Retna 5K iMac in 2014, 2015 and likely later models needs to sue Apple for gross negligence in the design of that model. We are stuck with a defective product that is prone to screen image retention and Apple should be forced to pay us back. WHY? This is a design flaw and not the BS that Apple is pushing. This is not an image that is caused by the screen, but something else in the design or way that Apple implemented the graphics screen management. Try it out: There are some things that just do not make any sense. 1. Give yourself a second vitual desktop and change the background colour of it to a medium gray. That way you can easily see any retained image. 2. On either the main or vitual desktop screen, load up Safari and have it display a mostly white with some black or dark coloured areas. 3. Hit the Shift Control Eject keys to turn off the screen. Go away for 3-4 hours. When you turn the screen back on, you will have image retention of the Safari window even though the screen was turned off and displaying nothing. WHY?? 4. Go to the main screen and assign a black and white checkerboard background. 5. Close all open application so no program is on the screen. Leave the screen turned on for 3-4 hours. Then change the backgound back to medium gray. The only things that will have burn in are any of the desktop icons and the menu bar / doc. The background image doesn't leave image retention. Nor does the mouse icon. WHY?? Those two items disprove that it is caused by what is displayed on the screen or a fault by the LG display as a display that is turned off should not get any image retention. Rather it is likely that the graphics display card is at fault. But Apple designed their own chip parts and made a hybrid ATI display card for the iMac. I think it is that display card that is a bad player and is causing the trouble inside the iMac. If an App window will cause retention but a background image doesn't clearly shows it has to be something other than the actual screen at play.