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No way...
Even without photoshopping, one can easily see you still have a yellow screen.
On top of that, I agree with other posters : you should definituely be carefull with posting such doubtful method -to say the least. Might bring more disaster to unexperienced readers .
You'd be wise to ask mods to delete your thread IMO...
 
I hate to say it, but there is some logic to what's being said. There was an issue with iMac screens shadowing on the edges that was caused by the screen being over tightened. The fix was to loosen the screws a notch.

That's just not accurate, sorry. The way every iMac since 2005 is put together makes that impossible. I was also a Genius for five years and this was just never an issue.
 
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