Hi, I bought this keyboard recently ( http://store.apple.com/us/product/MB110LL/A?fnode=MTY1NDA1Mg&mco=MTA4Mzc4ODA ), it has 2 USB ports on the side. In 1st I plugged the mouse and the other I plugged this speakers ( http://www.logitech.com/index.cfm/notebook_products/speakers/devices/200&cl=roeu,en ). The problem is that when I'm in Windows 7 it says the hub has not energy enough to connect the devices, and the speakers do not work. Now when I'm on Mac OSX the mouse and the speakers work perfectly. Does anyone have an explanation for that? Sorry about my english, and thank you.