DIAGNOSIS Yeah, this one's common. It's coil whine from the monitor's internal power supply or components, and it's often related to the refresh rate or brightness level. It's an annoyance, not typically a sign of impending failure.
FIX The noise often changes or diminishes with the refresh rate. Try changing your refresh rate in Windows display settings from 144Hz to 120Hz and see if the buzzing changes pitch or volume. Sometimes simply adjusting the monitor's brightness (via the OSD, not Windows) up or down a few notches can shift the electrical load enough to reduce the noise.
IF THAT DIDN'T WORK Check if the buzzing is tied to a specific on-screen activity. If it gets noticeably louder when you're gaming at high framerates versus looking at a static desktop, that's classic coil whine. You can try enabling VSync or a frame cap to see if a steadier frame delivery quiets it down.
HEADS UP This noise is often more noticeable in a very quiet room. Before considering an RMA, know that a replacement unit might have the same issue, or it might be quieter—it's a bit of a lottery with many electronics. If it's loud enough to hear over normal room noise, then it might be worth contacting support.