There are no 'HDMI Functions' or "settings". You can only select the 'output' screen from your Desktop > RT Mouse click > Screen Resolution > then tell it to use the 'detected' display (FN F4 which you need to repeatedly cycle through does same things of Laptop Screen, Laptop Screen + external screen, External screen, etc.). If the external screen is not showing (click detect) through the drop downs then either check the cable is working (say connect the HDMI to your blu ray does it work? ) and most of all CALL TOSHIBA's support number for assistance (see the INSTRUCTIONS in the BOX the laptop came in). That is why you paid that amount, it includes Toshiba's on call staff to help you.