RE: Dell 7450 AIO How to add a second monitor via HDMI out or Disport
The Dell 7450 AIO has a Display port and an HDMI Out port. The system also has a button on the right side of screen just above power on button, when pressed the first time screen displays "PC", pressed again screen displays "HDMI", pressed again screen displays "HDMI ?". The words PC, HDMI and HDMI? will display in the lower right side of screen. However image on desktop never changes and second monitor goes to power saving mode.