Not sure this will work for everyone, but it worked on my Dell P2411H
I was getting this really loud buzzing sound from my monitor today…and only when I was viewing Excel docs fully maximized.
I just reinstalled the monitor driver, rebooted and no more buzz.
Most of you will know how to do this, but for those that don’t…
Type "device manager"
Click on "Device Manager"
Right click on your monitor
Open Device Manager
Right click on any icon
Select Scan for Hardware Changes
Follow the prompts to reinstall the monitor driver