I couldn’t find any manuals or schematics online about this exact board so I had to figure out where to plug the HDD LED activity light on the board. It’ should be written on the motherboard like the other front panel items (power led, turbo led, turbo switch, reset) but that wasn’t the case. HDD IDE LED pins are located at the top of the motherboard (J6 and J4 pins).

Model number of the board: