What is the minimum number of dead pixels?

Hi. I recently purchased an Apple LED Cinema Display. It's very beautiful but i have found one dead pixel. The reseller refuses to change or fix it because they can offer assistance only for more than 4 dead pixels. I called Apple and they said me that "one pixel is accetable". In my opinion, aboslutely NO!
Does anyone had his LED display changed with only one pixel dead or stuck?
What is the minimum amount of defective pixels to ask for assistance? Some say 4, other 7...
Thanks

Apple replaced it. When I booked the appointment with my local Genius as requested a phone call prior to the appointment. During the phone call the Genius was very professional and courteous, and told me that he would be replacing it as an exception and that strictly speaking the 24" display could have up to 9 dead pixels before they would consider it a defect. Never mind this though as they did replace it without any hassle.

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