The Power LED and the HDD LED pins are polarity sensitive. If the LEDs don't work then switch the wires between the two pins. HP Support Community
is an OEM motherboard manufactured by MSI for HP, commonly used in HP Envy 700 series HP Support Community Socket & Chipset: ms-7826 motherboard manual
I understand you're looking for the manual for the . This is a common OEM board (often from MSI ), typically found in HP or Compaq pre-built desktops (e.g., HP Pavilion 500, 550, or Compaq Presario series). The Power LED and the HDD LED pins are polarity sensitive