Where is my DVD loader

Did you connect the monitor to the correct port? If you have an add-in video card, (eg AMD or Nvidia) you have to connect the monitor to the add-in card. The on-board video ports will be disabled. 

If you have an add-in video card, it will be located in area where arrow points. Video ports in the area with red X won't be working.

Check out the front view here, so see where your DVD drive and it's eject buttons are located.

https://support.microsoft.com/en-us/help/10771/windows-dvd-playback-options