Why my monitor screen is darker than normal one?

I am not sure if this is the monitor, its cable or the windows settings which gives me a darker screen. Can you please help? I put the power balance to it's high performance which gives me the highest screen brightness and also the monitor settings to it's max, but still I am having a darker screen than... show more I am not sure if this is the monitor, its cable or the windows settings which gives me a darker screen. Can you please help?

I put the power balance to it's high performance which gives me the highest screen brightness and also the monitor settings to it's max, but still I am having a darker screen than the normal ones.
Is that because of the monitor cable? or the monitor is somehow damaged? I bought the monitor used.

It is a Samsung Syncmaster P2250.

How do I know if the problem is with which part?
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