Question ROG Strix x470i. Replaced case fans. Now no POST

Mar 14, 2020
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I just replaced the case fans on my build with 3 be quiet fans via a splitter. Build no longer posts. Imagine my surprise.

System:
https://pcpartpicker.com/list/TWvPvW

I observed it in the case and see that on hitting power button the fans spin up and the Q LEDs light up red (cpu), white (vga), yellow-green (boot). Then the fans spin down and the boot process restarts (fans up then leds). The yellow (dram) light never lights up.

I have the mobo out on my desk now with only power, ram, cpu, and gpu in place. Same boot behavior outside the case. If I try to boot without the GPU I get red and white lights but no yellow-green before the fans cycle down and it starts over. Have tried both sticks of ram individually in slot A1. No change.

Any ideas? Many thanks. No idea how replacing my case fans could cause this.
 

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