Question Power button won't work after gpu swap even though power sw cable is connected?

Aug 1, 2020
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Hello, this is my first question on Tom's hardware and I really need help with fixing my PC. I was doing a gpu swap and after it was done I couldn't turn on the PC with the power button. I could manually turn it on through the motherboard but the power button doesn't work. The power sw cable is connected, so what could be the problem?