Go to solution Solved by OhYou_,
that is the light to indicate a fault in the power detection, it is there on all 40 series gpus
It is either white or red and comes on when there is an issue with the sense pins for the plug.
Here is a reddit thread talking vaguely about it https://www.reddit.com/r/nvidia/comments/yog5n8/no_white_led_on_my_rtx4090_when_using_cablemod/
i am not sure why it is coming on at power loss, maybe residual power in the motherboard due to capacitors for audio filtering.
idk what your clicking sound is I dont have heaphones
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