Question PC wont turn on when PSU connected to motherboard,

May 7, 2024
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Hi guys, I got a problem when turning on PC yesterday, all of a sudden it stopped turning on. I had it happened once before but I played with PSU unplugging plugging it in, and it worked, not this time.
I took mobo and everything out if case, took paperclip and shorted 4, 5 pin if 24pin and PSU worked good, giving power to fans and RGB, but when I tried connecting it to mobo again and jumpstart with screwdriver its not working.
I also tried inserting everything again like fans, RAM, 8pin CPU and 24 PIN : not working.
please help
Cpu is i5-12400KF , 3060TI Gpu, msi 660 mortar ddr4 mobo
 
Also I dont see any LED or beep indicators on my mobo, I dont think they are factory installed so I cannot check wether its getting power from PSU, but it should give it as it is working without connection to mobo
 
no debug led?
did you plug in both the 8 pin cpu power?
Yes I plugged in 8 pin, I dont see any response from any component when I try to jump start it, no LED indicator installed in MOBO I believe, there are some debug leds but they are not lightning up