Confirm that the horizontal scan rate being used by the video card is well within the range supported by the monitor. If it isn’t, change it to be a one that is – in addition to possible whining, this is stressful on the deflection and power supply and may result in an expensive Appliancerepair La.Com Repair in a very short time. Even if the scan rate is supposed to be fine, changing it slightly (e.g., 5 percent) might help just because it shifts the deflection frequency away from a mechanical resonance. However, this may not be a long term solution. As much as you would like to dunk the monitor in sound deadening insulation, this should be avoided as it will interfere with with proper cooling. However, the interior of the computer desk/cabinet can be lined with a non-flammable sound absorbing material, perhaps acoustic ceiling tiles. Hopefully, not a lot of sound energy is coming from the front of the monitor. Move the monitor out of a corner if that is where it is located – the corner will focus sound energy into the room. Anything soft like carpeting, drapes, etc. will do a good job of absorbing sound energy in this band. Here is your justification for purchasing those antique Persian rugs you always wanted for your computer room 
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