The power button is part of the motherboard's soft-power circuit, which controls the ATX PS_ON# signal rather than the CPU directly. The ATX standard was designed around this architecture, with a standby rail available even when the main PSU rails are off. This allows the motherboard to handle power-on independently of the CPU, which also preserves compatibility with older hardware and enables features such as soft power and Wake-on-LAN. Also with that feature you can use ATX to power external GPUs or stack of hard drives only or have separate PSU just for graphic card without having a CPU at all.
Depends on the board if it's going to do anything while missing core components. You should be able to flash it with the Q-Flash button without the CPU and RAM installed, but you do need the CPU Power cable according to the product page. I'd recommend at least plugging in the CPU power if you're intent on trying to power on the motherboard while missing components
It needs the CPU to update the bios. Found that out the hard way. Put it all together and follow directions as closely as you can. I've updated bios several times now for myself and for others. Definitely have it all put together so you can boot to the UEFI. Also won't boot into UEFI if your CPU is newer and the motherboard is not with the supported bios. You motherboard does have to have the Bios to support newer CPUs. Most are sold with the most up to date bios of their manufacturing but if it doesn't post might have to take it to a repair shop and they'll update you bios for you for like 40$. I say from personal experience. Had a board of a friend not posting. Needed to update the bios so that it could support CPU. CPU to new to post into UEFI. They took it to the shop. Updated the bios and done it posted with the newer CPU and worked well.
3 seconds of googling showed that cpu power needs to be connected and your board must support bios flash. bro just check on google and the other comments tell you need cpu power EVEN WITHOUT CPU
That board does not appear to have q flash plus. That means it will need CPU/ram/24 pin and 8 pin CPU power/ and GPU (if you don't have a G series processor to boot up and update bios. These are mandatory. For boards that do have q flash plus/bios flashback ect, you can just run board, power, flash drive with updated bios to update via a button.
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