Hi -- When you buy goods (including goods supplied as part of a service), the law gives you certain rights as a consumer. The law says that the goods must:
1) Be of satisfactory quality. This means that the goods should be free of any faults, including minor ones. They should be of the quality that a reasonable person would expect given the description, price and any other relevant circumstances. You can take into account the appearance and finish of the goods, and whether there are any defects (including minor ones). You can also take into account whether publicized information about specific features of the goods is accurate, and whether the goods are safe when used properly
2) Be fit for the purpose. This means that you must be able to use them for the purposes that you would normally expect from this type of product, or any purpose that you have told the seller you want to use them for
3) Match their description. This means that if there is a verbal or written description of the goods, it must be accurate. And if you choose goods after seeing a sample, your goods must match the sample.
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The fact that your laptop has even a minor fault which is obvious so soon after you purchasing it gives you the llegal right to reject it as being unfit for it's purpose and of an unsatisfactory quality under the "sale of goods act as above, you must return the item and demand that you have a full refund, if you are not prepared to accept a new replacement. What they descibe as a defect not affecting funcionality does not mean that you cannot reject it as being unfit or of unsatisfactory quality.
Would you accept a new car if it had scratches on the paintwork, that didn't stop you from driving it. ????
Remind them that Pixels are not mentioned at all under the sale of goods act, but minor faults are, as indeed anything that is not of the standard expected, is certainly also mentioned. ! Unless they can demonstrate that all these Sony laptops were designed to have pixel faults, then your's is defective.
If they refuse then put this in writing to the Manager.... that unless they do honour your legal rights, the matter will be pursued through the courts.
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If things go wrong with goods you have bought, you have the right to return them and get all your money back (a full refund). However, this right only lasts for a very short time after you buy the goods. You are allowed a short time to examine the goods and try them out, but you must tell the trader about the fault as soon as you discover it.
You have qualified and complied in full with the above statement, demand your refund or a new replacement if you are prepared to accept that.