I have 2 dell monitors next to each other and one is so dull?

Q: 1 is a 17" the other a 22" the 22" is not as nice as the 17" but it has a better and brighter screen. how do i change the 17" to bright? thanks its weird, they are so different and the 17" is so dull!

A: Have you considered cleaning the dust off the screen? Just a random thought!

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