Individual pixel errors on screens are generally not a reason for complaint and will be rejected by the manufacturer. However, some manufacturers offer a "Zero Dead Pixel" guarantee that covers defective pixels regardless of the number. Many monitors purchased from us have pixel error class II, which is why individual pixel errors do not constitute a material defect. Further information about the pixel error classes can be found here: https://en.wikipedia.org/wiki/Defective_pixel
Please note that this warranty may vary depending on the manufacturer, and be sure to check the exact terms before purchasing.