IMac screen chessboard problem

Hi, I've got the old imac white from around 2008 and until now it was brilliant. But...yesterday a problem occured, after the initial aoole logo and the bluescreen this appears:
When I start the computer with the shift button the screen is ok. When in safe mode only the mouse pointer is affected- it has horizontal gray lines around it.
Any ideas?

Hello PalmerMac,
Yours is one of many such reports. Sadly because you are now out of both warranty and Apple Care (should you have had it), the cost of clearing it up will fall upon you.
Whatever else you may hear, unless you are truly competent, do not buy a glass screen and try to fit it yourself. Have the job done properly by an Apple retail store, or a premium re-seller.
Here is a link to a typical report ... Greyish Smudge marks behind the glass...: Apple Support Communities ...
Just look at the number of posts ... 940 and counting.

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I got a 24" iMac from Amazon and noticed the screen gradient after a few hours of use. Then I also noticed a stuck pixel in the middle of the screen. I was very bummed and after reading through forums I realized that this seems to be a common problem. I was getting prepared for 3 "geniuses" gathering around my iMac telling me that they can't see anything wrong with it and then me trying to sell it on ebay with a $500 loss.
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I have a 6 month old (late 2011) iMac 27" 2.7-i5-4MB/1TB, the screen constantly blanks with the iMac still running and the screen still with content on (can just see if I shine a torch at it).
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Your iMac should still be under AppleCare warranty.
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Hello,
The 2012 macs (and later apparently) not waking normally from sleep after hours being in sleep. (noted here ...
http://www.xlr8yourmac.com/archives/feb13/022813.html#2012macswontwake
"Why 2012 iMac/2012 Mac Mini won't Wake After Hours of Sleep (Hibernates/Powers Off)")
The sleepimage file still reappears even if never slept. Delete it (hibernate off, etc) - within minutes its back.
Anote on that here - http://www.xlr8yourmac.com/feedback/Chameleon_SSD_Optimizer.html
About iMac sleep, but...
http://forums.macrumors.com/showthread.php?t=1529750
https://discussions.apple.com/message/22336226#22336226
Daniel Leary 2008
Re: Mac Mini wake up issues
Okay this workd for me, I typed into Terminal:
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Hi autiger
Which iMac do you have and are you having any display issues?
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Does anyone have the actual tech specs for the screen itself in reference to the 24" Imac (response time, etc.)
How do you think the screen on the 24" Imac compares to this HP 24" monitor?:
http://www.shopping.hp.com/product/display/display/1/storefronts/RY117AA%2523ABA

blair.harrington wrote:
Does anyone have the actual tech specs for the screen itself
in reference to the 24" Imac (response time, etc.)
The 24" ALU iMac's display panel is an *LG.Philips LM240WU2-SLB1*.
According to TFTcentral, it's an 8-bit S-IPS panel. For more specs see:
http://www.tftcentral.co.uk/articles/panel_parts.htm
Great specs, but the specs don't say anything about iMac's problems with
uneven backlighting. The white 24" used the LG.Philips LM240WU2-SLA1,
and had a gorgeous display -- as does NEC's professional LCD2490WUXi.
Check the specs, but also check some [24'' ALU iMac screen photos.|http://picasaweb.google.com/TheLooby]
How do you think the screen on the 24" Imac compares to this HP 24" monitor?:
[HP w2408|http://www.shopping.hp.com/product/display/display/1/storefronts/RY117AA%2523ABA]
I don't have a mfgr's part number, but it uses a 6-bit TN panel. Faster
than S-IPS, but significantly poorer viewing angles. OTOH, it probably
doesn't have the brightness gradent problems common in ALU iMacs.
For $75 more, HP's LP2465 and Dell's 2407 have superior 8-bit LCD panels,
and much better warranties (3-year & 5-year versus 1-year on the w2408).
I'm sure there are many other good (or better) choices as well, but I haven't
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Your are missing the point. Yes, there will be the occasional Mac that has a display failure.. Yes, there will be a number of LCD displays that fail out of the millions of Macs that are assembled with LCD displays. And yes, techs will be seeing those occasional display failures over the wide array of Mac models upon which they work. But there are a number of companies that make LCD displays for Apple with the various Mac models that exist. And sometimes there are different companies making the displays for the same Mac model. These are the random, occasional display failures that can be expected with every computer manufacturer who assembles massive numbers of computers; Apple, Toshiba, Dell, Sony and on and on.
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IMac screen chessboard problem

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