[SOLVED] Pc won't boot

[snipu]

So my pc was on and i didn't do anything and all of a sudden my pc turns off. it starts but my monitor says no signal and my keyboard won't light up. also other usb things won't work. i have checked that all the cables are on the right places. motherboard's ez debug light is on vga and the light is white. I tried the parts on a different motherboard and the same thing happened but the other motherboad's ez debug stays on cpu. I updated bios and did cmos cleanup. Also gpu fans are spinning for a while and then it stops. the gpu isn't broken because i tested it on my friend's pc and it worked.
CPU: AMD Ryzen 7 3800X
GPU: NVIDIA GeForce GTX 1070
Motherboard: Asus ROG strix B450-F gaming II
2nd Motherboard: Msi MPG gaming carbon wifi B550
PSU: Corsair RM 750X (new)

 

[chaoyang]

Try removing all your other components except your CPU, GPU and PSU.

Remove your RAM, HDD, SDD. Then boot up your PC connecting to your monitor (connect through GPU card).