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Minimum quantity of dead/stuck pixels

It seems that if your Mac doesn´t have a minimum quantity of dead/stuck pixels, Apple can´t do anything. See below a link that explains it:

http://support.apple.com/kb/HT1721?viewlocale=en_US

I bought an iMac 20" on April 28 and it has one stuck pixel in the middle 😱 of the lcd display, so I´ve sent it to a technical assistance and they´ve answered with this link.
 
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