^^^
No, my point is that the customer bought a laptop and does not fulfill that which is contracted, that the machine is brand new and functional. The ISO has nothing at all to do with it. Apple has a return policy, and the customer is dissatisfied not only at the material defects, but that the remedy is to "spin the wheel" on another machine that may not make the grade. And unless the store was specific in stating that screens can have so many defects, or the unit is sold as-is, this is nothing more than misrepresentation and fraud.
The law doesn't care how any pixels an LCD has, and whether or not they light up or not - what the law concerns itself with is that the contract (in this case, a retail purchase) is fulfilled. This is concealed damage, and if it was brought to court as a case, the judge would rule based on resetting to the status prior to the contract, that is, the store would hand back the cash for the product. I have never been in a retail store where there is a sign stating a policy on "dead pixels", nor have I ever seen a disclaimer in an advertisement stating a policy, nor have I ever talked to a salesperson who stated that such a policy exists.
The point on whether or not dead pixels can cause harm or not, or whether there is a specification registered to the ISO, makes no difference. It is all about the terms of the contracting parties, and the customer has the expectation that they will receive a fully functional machine free of defects, while the store has the expectation that the customer will pay in full. In this case, the customer did not receive the goods in good order, are dissatisfied with the defective product, and the store did nothing but threaten the customer about some policy that had never been disclosed.
Harm is another issue all together. If this was applied to say, a car, a customer could sign a contract with the dealership, which locks the customer into the deal, then the dealer could go carve up the dashboard with a knife, and make the claim that the car is entirely fine, since it runs, and that the carved up dashboard offers no harm to the customer. However, the law does not look at it that way. If the car was purchased new, the customer has the expectation to receive a car in good order, free of such defects, and that if the car does not make the grade, then the car company has to make the corrections in order to compensate for such defects. Now, if the car was used, and sold as-is, and the dashboard was carved up prior to sale and that damage disclosed to the buyer (who agrees to purchase anyways), then the situation is different.
The other fact is that the vast majority of LCD screens are entirely fully functional, and only after 7 years of on-the-road use (and being left in the car to roast in the summer or freeze in the winter), the screen is still fully functional with the exception of one stuck pixel at the top tip of the Apple stem, which stays green. I think few people have problems with dead pixels, and the assembly processes are vastly improved since the ISO cooked up a standard.
I think the customer, paying large money for a brand new sealed in box system, entirely has the right to not only expect a fully functional machine, but to recieve a fully functional machine - and if the machine is not fully functional, then it is up to the store to either exchange the unit for a functional machine, or to replace the LCD with a fully functional unit, or to dish out a refund.
Counting pixels is bunk, because they replace defective hard drives all the time, even though it may be a small, 1KB error in Track 0 - which on a 1TB drive is negligible. For a dead pixel to be apparent, it will be a clump of three or four dead pixels, which is a real defect by any measure.
For the sake of swapping a machine and keeping a customer happy - that store is surely loosing major sales because it is all about telling friends not to go there because of shoddy service or because they sell defective products. It's the same mentality that clobbered GM, with endless runs of defective cars that no one wants. This is such an unusual situation for Apple, since they pride themselves on their 14 day trial - and are miles above the shoddy service shoveled out by Dell, though Dell will entirely replace a defective LCD, especially if the dead pixel is in the meat of the screen, and not a solitary pixel out of the borderlands which would not affect the use of the machine.