This B650 motherboard DOES NOT have a power button on it. There is only the RST_SW button. As I mentioned in my post the Manual explicitly states to use it to turn it on/off...
Quick Button
The reset button (RST_SW) allows users to quickly turn on/off the computer in an open-case environment...
I have the following new hardware I purchased for a new desktop machine.
Gigabyte B650 GAMING X AX ATX AM5 Motherboard v1.0
AMD Ryzen 9 7950X3D 4.2 GHz 16-Core Processor
Noctua NH-D15 82.5 CFM CPU Cooler
Corsair Vengeance 32 GB (2 x 16 GB) DDR5-6000 CL36 Memory
Kingston NV2 2 TB M.2-2280 PCIe...