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Why is my monitor backlight flickering at a slow but constant rate?

Why is my monitor backlight flickering at a slow but constant rate? I have a Dell S2417DG and recently I brought it with me back to Australia. Today I plugged it in but noticed that while everything worked fine and there’s no damage to the device that I can see, it is having this weird issue where the backlight would flicker slowly but constantly. It’s at 100% brightness for 3 seconds then it would dim a little and stay there for another 3 seconds then return to 100% brightness and back and forth.

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