DIAGNOSIS: Coil whine from the monitor's power supply or backlight inverter. Common under high brightness/HDR load.
FIX: Go to the OSD. Navigate to 'GameVisual' and select a mode like 'Cinema' or 'sRGB'. Then go to 'Color' -> 'Brightness' and reduce it from 100 to 80. This lowers the electrical load on the components causing the noise.
IF THAT DIDN'T WORK: Ensure the monitor is plugged directly into a wall outlet, not a power strip or UPS shared with other high-draw devices. A clean power source can reduce noise.
HEADS UP: This noise is generally not a sign of imminent failure. Do not open the chassis to try to fix it. You will void the warranty and risk shock from the internal power supply capacitors.