ASUS AIO PC power light on but HDD light is not

ASUS ZEN AIO pro PC was working fine two day ago. After power on the pc, HDD light on the front panel did not light up but power light is on.

I tried many time on & off and it only give out seem like fan running sound with screen remain black, no beep sound too. I also tried disassemble and lift up the front bezel, re-plugged the HDD cable but still remain same.

Any idea which area I can focus on?