Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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Is my screen display dead?

Suddendly, when retourning from sleep, my imac shows a grey/black background with some vertical lines in the center. iMac running ok (I can see it with a second monitor) but showing nothing through its display... Any idea of what is happening? What's broken down? And, after that, how much could cost to repair it?

(NVRAM reset already done)

Answered! View the answer I have this problem too

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Since your external monitor is working, go for the LED driver board. Look for burned areas or components or cold solders. iMac Intel 21.5" EMC 2428 LED Driver Board Replacement

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Hi, how wonderful to be able to open my iMac by myself! But I am afraid I couldn't reassemble it without leaving any dust speck... So for the moment, I'm looking for a solution not involving to open it, even I don't know if it's possible. I found some people talking about the fans speed, finding their problem solved. Therefore I'm going to save your suggestion for later. Thank you very much mayer.

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@qkfera What do you mean without leaving dust? There is tons of dust in the computer already. Just use a microfiber cloth to clean the dusk off before reassembly. Also maybe do this in a room that doesnt have much dust to avoid it

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Is that easy? Can anyone without a "special room" or "special conditions" do it and leave the display perfect, as now that has never been opened?

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@qkfera Well, yes. If your careful not to touch the inside of the glass or the screen. When you remove it, set it down on a clean towel, the side that is inside the iMac facing the towel. Then when your done, if there is any dust, clean it off using a MICROFIBER towel as those wont scratch anything.

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Cameron is correct. These things are like vacuum cleaners. After years of sucking in room air they filter out floating dust. After you get the screen off, take it outside and blow it out with canned air.

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