Pin Positioning

[Appzalien]

Not that it matters at this point, but when your dealing with the case front connections if its a switch, like power or reset, it doesn't matter which way since a switch is nothing more than a break in the line. If its an led, speaker or other indicator then polarity matters. Reversing the polarity on the led may not cause any noticeable problems but it could be doing something that you will not notice until you use it like with firewire or usb, you never know, it kind of depends on the mobos circuitry. I reversed an led once on an intel board and it caused problems but it was so long ago I can't remember what it did.

[optimus_prime]

And it does seem to match HDD activity, as clocker previously said.

then it IS an ide led probably side by side with power led making you think it's the same source. it actually comes from other two pins (marked orange on pic below) and your power led is just sitting dead you can test it by pulling it off the board completely.