new pc build not turning on

Hello everyone, sorry for the lengthy question. I built my first PC, and it worked for 30 minutes, then it stopped. I was installing updates and thought to do the BIOS update as well, and that's where everything stopped. Monitor, Keyboard and Mouse have no power or light on them coming from the...

So I decided to upgrade my pc. Finished assembly and tried to turn it on. As I turn on PSU switch, the motherboards LED turn on as well. Then I turn on PC. Heartbreaking split second as fans of GPU and PSU make one turn and stops. No error lights on motherboard. No fans are working and Nothing...