TechLawn on Instagram: "If you want to purchase an old laptop, you must check these 5 important things while you go to buy it: - Firstly you should open the Notepad and should press all the keys of the keyboard to check whether they are working fine or not. - Then, you should search on google “Dead Pixel Test”. Then click on first link and start the test. As you keep on pressing the space button, it will show you different colours on the screen. It helps in testing whether there is any dead pixe

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