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I have the same issue. I've tried upping the fan speeds and using a screen saver, but it doesn't seem to help that much. The only way to get rid of the burn-in seems to be to turn off the iMac for a few days.
Very annoying, especially since I noticed this problem only a few days after the warranty ran out. Considering the steep price of the iMac, I really hope Apple can come up with some solution to this.
same problem here, but doesn't go away. Here too, it is even there during boot. I shows up on darker backgrounds like on the built in background colours "dark aqua blue", but less so on lighter ones and especially NOT AT ALL on plain white. (Still, the same "burned in"-pattern is always still there if I change from a white background back to a darker one after some time.)
My iMac is out of warranty. Any Idea, guys?
i never turn my mac off so i didn't notice it, but had to move my 24" and when it rebooted the white screen has many gray spots especially in the upper right quadrant. also gray dirty marks universally on the screen. i can't believe i didn't see it before. my baby is only 16 months old, no applecare, i'm going to live with it unless there's a recall. i think someone with apple needs to step up on this one. ipods and iphones are selling well but if it hadn't been for the diehards, they could have gone down in flames with the Lisa.
I started noticing screen burn-in on 24" iMac a few days ago.
Specifically, the Firefox toolbar leaves a ghost image at the bottom of the screen. The machine is one year old. I do not have AppleCare.
I will try the suggestions mentioned in this thread and if that fails to fix the issue I will call Apple and play hardball with them.
So after installing smcFanControl and Brightness Control the problem has (for now) been resolved.
HDD and CPU fans are cranked pretty high and screen brightness is at Apple's minimum setting and bumped down an extra few notches with Brightness Control.
I still think Apple needs to address the overheating/screen issues that seem to plague more than a few iMac users.
This is all very troubling. I'm just a few days away from buying a 24 inch imac (3.06 GHz) and I'm not so sure anymore. It seems this problem has been going on for a while now and Apple hasn't stepped up to the plate to resolve it. This thread has been viewed over 22,000 times and still nothing from Apple?? That's shameful.
That is a cop out on Apple's part.
I paid a lot of money for this machine and these "imperfections" are not acceptable.
The facts seem to be:
1) The iMacs' cooling system is inadequate (due to a DESIGN FLAW) and the computers run too hot.
2) The overheating issue seems to be causing problems with the display.
3) Apple is playing dumb/ignorant and disrespecting its customers.
Has there been any official response from Apple on this matter?
Normally such an obvious hardware based fault like this that is common to a particular model requires a recal and replacement or refund from the manufacturer.
Simply replacing my iMac with a new one is just going to give me another 6-12 months before the same thing happens again so that is obviously not a solution to the problem.
This is terrible publicity for Apple and I expect that they'd be rushing to remedy this and right the wrong they have done to their customers. In the two days I have been aware of this matter I have already told two friends who were thinking of getting a 24 inch iMac not to. They are both PC users considering switching and I'm afraid this has stopped them crossing over to Macs.
Like a idiot I left my screen on for a little over 18 hours, when I returned to my iMac all the disk icons, folders, dock, menu bar had all burnt into the screen.
I searched and searched for a possible solution and after a few hours I managed to find a solution which did correct my screen.
A few websites recommend watching a few full length movies using the iMac, well I did this and after 2 hours worth movie there was a slight visible difference. The next was to use a screen saver called LCD Scrub. I used LCD Scrub with the 'High Contrast' selection running for 8 overs (over night) when I awoke this morning, I immediately checked my screen and everything was back to normal, screen burn gone.. everything back to normal.
So, to summarise
1. Watch or just leave a DVD/Movie running
2. Use LCD Scrub - following instruction in the screensaver field
(LCD Scrub = http://toastycode.com/lcdscrub/ )
As mentioned, the above method worked for me