Ah ok, sounds like a mobo issue. Also try assembling the components outside your cabinet and run it to rule out any shorts or issues with the power button.
Power button is fine. I had that doubt myself aswell so checked it and it seems to be fine.
Will try assembling the components on a box. I guess this is the only solution left to check now.
Ps- would placing the mobo working on a cardboard box be safe?
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