The IDE LED header is a solo 2-pin header. On page 25 of the manual, it's the vertical 2-pin header at BUZZ1's 2-o'clock position, not the horizontal one that says SMB1 at the right end. If you've already got it on there and it won't work properly in either direction then try shutting down, disconnecting non-essential drives and booting up that way to see if it makes any difference. Otherwise, --->