Hp 2310 monitor low volme high pitched sound - whining - low volume

My monitor makes a low volme high pitched sound
But only if I go above 1400 x 900 resolution.
Below that it is okay
2 years old.
Otherwise not a problem.
Brightness 45
Contrast 100
Backllight hours 12259

It's not totally unusual that as electronic circuits age a high pitch whine will develop depending on the monitor's settings. Additionally, some people's ears are more sensitive to higher frequencies. It happens.
======================
Is the monitor safe to use in the meantime while it whines? Sometimes I have to use the higher resolutions.
Right now, it is not a big deal. Since I use 1440x 900 and have it set to where there is no (or an imperceptible) whine [That can alter with brightness or contrast changes] , am I safe to use the monitor?
At 45 for brightness, and 100 for contrast, a 1440x900 resolution is okay - no noticeable noise.
Can safely run the monitor with the whine, on those occasions when I have to change the resolution.
At what point should I get a new monitor?
BTW: Changing Brightness and contrast can alter the whine, but what works for one resolution will not work for another.
So I leave the brightness and contrast alone, and tolerate the whine if I temporarily have to change resolutions for my graphics work.
Because if I reduce the whine on a higher resolution, it will screw up my 1440x900 resolution.
What causes this?

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Hp 2310 monitor low volme high pitched sound - whining - low volume

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