Hello :) This is my problem with the case Cooler Master Maker 5 : USB Led does not work... no light on PS : sorry for my bad english (i'm french) Solved by the Cooler Master Support : Do you have connect also the Molex cable from the fan/LED control PCB? The Molex provides power to the fan controller and the LEDs on the top IO panel. Check also this link for a short explanation and check if everything is connected properly: http://coolermaster.force.com/pkb/articles/en_US/FAQ/Install-MasterCase-Maker-5-LED-Fan-Controller-PCB/?q=mastercase+maker&l=en_US&fs=Search&pn=1 >>>> Thanks a lot to the Cooler Master Support : it works ! I forgot to tonnect the Peripherial Cable connection to a 4pin Molex Connection from my power supply. I would like to wish you and your family a very happy new year. Best regards, Eric E.