HP 1825 User Manual page 5

The DVI-D cable supplied with this monitor is for digital-
to-digital connection only. Your computer must have a
DVI-compatible graphics card installed for use with this cable.
When connecting the DVI-D signal cable to the DVI connector
on the monitor, you must connect the other end of the DVI-D
cable to the DVI connector on the computer.
3. Connect the monitor signal cable to the back of the monitor.
4. Connect the power cable to the back of the monitor.
5. Connect the power cable to an electrical wall outlet.
User's Guide 3