*i don't know for sure if it's my motherboard or my case (switch)*
problem: when i press "power" the lights on my motherboard and the front panel (case) led's lights up as normal, as well as the case fans turns on as normal.
wait 1-2 seconds the led lights on the front panel and on my motherboard turns off, as well as my case fans.
you should have 2x 6 pin PCIe cables for the graphics card, 1x 4/8 pin ATX12V cable and 24 pin motherboard cable along with the molex, fan and sata cables where they're needed.