How to get a refund for my PC?

nearly a year ago I purchased a all in one Lenovo PC from a shop, It was a lot of money and I want to get a refund for it as it is no longer what I want.

The shop has a 90 day return if not satisfied, which has expired now and I want to break the computer but it cannot be caused by accidental damage or misuse so how can I get a refund for this?

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