I have a TBD connected to my 17" late 2011 MBP. MY TBD does get warm. Typically if I am facing the display the left side at the underside bottom portion of the bezel gets warm, not overly hot but warm. The right underside bottom portion stays very cool. I assume that the difference in temp is due to the power supply being located on the left side (facing the montior) but my QUESTIONS IS: I don't hear the internal fan at all. I assume the fan is working but I have yet to hear it turn on or draw any attention to itself, shoudl I be concerned?