If you go for the pins marked "Fan" (as mentioned by Bruno) and one of the screws that secures the mainboard to the lower case the fan will be on when the player is on i.e. playing or paused but it will stop when in standby mode. You might find the fan's a bit noisy so you might want to put a resistor in series with it to slow it down. Search the BBS you'll find plenty of discussion about it. Good luck.