M1 Active 520 Monitor Flashing Red & Making Loud Pulsing Noise

Hi

One of my M1 Active 520 monitors flashes red and makes a really loud fast pulsing noise immediately when turning it on.

I've tried turning doing the volume on the monitor and all gains are set to zero on my mixer but I still have the problem. Same issue occurs if I leave the monitor unplugged from everything apart from the power.

Any ideas what is wrong? I have recently moved to a new place, and though I was super careful with them, I'm worried it may have been damaged in transit.
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