Connect the power supply's 24-pin connector and CPU power cables to the motherboard, and connect the power switch from the case to the motherboard.

Hold your power supply's 20- or 24-pin motherboard-connection plug with the terminals facing you and the plastic locking piece facing upward and the flat edge facing downward.

Plugging in the 6- or 8-pin supplementary PCIe power connector means the 168W maximum of the 24-pin supply can be increased ...

New motherboard, new PSU, the only thing the same is the case. Seems like a faulty switch based on that, but the switch appears to close and open properly in every other case.

Which side of a PC case power or reset switch is positive or negative? (and can I damage my motherboard by connecting it incorrectly?) No, you won't damage a motherboard by connecting the power ...

Asus's latest volley in the war on PC cables includes routing power supply lines right through the motherboard headers to create a graphics card with no cables.

If a suitable top-PSU-mount case can't be found I'll probably pick up that Carbide. I see it has ample accommodation for running the PSU cable below the motherboard tray.