BenQ XL2540 User Manual page 14

You might want to adjust the monitor stand height.
See Adjusting the monitor height on page 20 for
more information.
You should position the monitor and angle the screen to
minimize unwanted reflections from other light sources.
2. Connect the PC video cable.
Either
To Connect the DVI-D Dual Link Cable
Connect the plug of the DVI-D Dual Link cable to
the monitor video socket. Connect the other end
of the cable (at the end with the ferrite filter) to
the computer video socket.
Tighten all finger screws to prevent the plugs from
accidently falling out during use.
To Connect the HDMI Cable
Or
Connect the plug of the HDMI cable to the HDMI
port on the monitor. Connect the other end of the
cable to the HDMI port of a digital output device.
14 How to assemble your monitor hardware