My mac pro ran this morning out of power in all usb-hubs. Also the bluetooth states that not available. Yestarday everything worked fine, had quite a lot running from the usb ports (wacom tablet and midisynth and some usb licence keys), but it worked fine. It didn't power the usb's down immediately, the power dissapeared gradually and now it's dead. Otherwise the mac pro seems to run somewhat normally... The usb hubs on my cinema display works fine, but I guess the power comes thru the display??? What is wrong with my machine??? please help!!!