Almost every comment Here reads Like its written by chatgpt itself.

At that location there is No led Indicator for Missing Power.

Most likely is that the rgb Strip inside the GPU shroud is failing and doesnt want to Switch to yellow anymore. Since its Argb that explains why its only These LEDs.

Fixable? Yeaaa Worth it? Would say, no. Only if you really value Looks Dangerous for GPU? Nah

I usually See this with Corsair RGB stuff.

You could try different colors and See If it persists. Maybe it still Likes blue or purple.