I will be buying a second hand monitor, a Benq LED Benq 24 V2420H FullHD.
What methods can I use to test that the monitor is OK. I mean like dead pixels etc.?
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Best way I can think of is show a fullscreen completely white image. Try to get the contrast on the monitor up a bit, then the dead pixels should stick out like a sore thumb.
For stuck pixels: http://www.gdargaud.net/Hack/DeadPixels.html