Question Used motherboard gives black screen and no input/output from USB or ethernet ports ?

Hi guys, just to be quick, i bought a used gigabyte GA Z77M D3H and i wonder why is it giving black screen?

All usb port is not detected (and powered), ethernet is not powered, but cpu is powered, mobo is powered, gpu is powered.

I am currently guessing that the i/o chip (the ITE chip) have some fault or something?

I tried to force backup bios load to main bios (i use a B75M HD3 so i know when the bios fail you could just press power and reset button for 10 secs) but no avail. i already tried both gpu output and motherboard output for display, still black screen.

Is this happened because the chipset or the i/o chip faulty? TIA.
 

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