Start up without electricity is possible. Use manual methods or backup power sources.
Start up without electricity is possible. Use manual methods or backup power sources.
If that block connector at the lower right matches your suspicion, this is likely the issue... the loose connector there. This block connector is typically in the zone reserved for the header of your PWR, RESET, or HDD switches and LEDs. It probably needs to be secured, likely for power switching. Make sure all connectors align with their designated pins; mismatched ones could cause problems and might even harm components.
Regarding the rocker switch on the back of the PSU, it seems it was likely sent in the OFF setting. Updated on June 4, 2022 by An0maly_76. Reference image provided.
LIkely not the issue, but I can't help but notice the screws mounting the PSU to the case are not the correct ones. I run an RM850x in my machine. Are you absolutely positive that your PSU cables are in the correct connectors and they are snugly fastened, not loose? The reason I ask is that there is a separate 4-pin CPU power that many newbies overlook, and with your motherboard shrouded, it might have been quite easy to overlook. Which board is it, BTW? Edited June 4, 2022 by An0maly_76 Revised, more info
I was using them because they were hair shoulder his unplugged and we plugged and made sure they will all snug. Just noticed the LED on the motherboard flash is white once a very quickly when I turn the powers supply. There is also a 4 pin up there I did not use Edited June 4, 2022 by Nukelolz