I have had this notebook for a year, and have connected as many as two external monitors (using the thunderbolt port and HDMI port) with no problem. I just moved, and now when I set up, with an external monitor using the HDMI port, the notebook does not see it. The control panel only shows the built-in display available. I have checked the cable and the monitor and they are fine. Is it possible my HDMI port failed?