I'm getting the feeling that the power coming from my USB ports on my mac pro is not consistent. I just had 2 logitech unifying receivers die on me that were plugged into one of the two ports in the front. From what I remember reading somewhere, the usb ports in the front have a stronger output or something like that. So my question is... 1. Is something like this even possible? and 2. Is there a way to circumvent this from happening again if it is? Like using a powered usb hub and plugging that into the mac pro first and then the unifying receiver (or anything else) into the hub?