Conclusion: To test the Hanns.G HL231 monitor, we first needed to hook up the monitor to our system. We decided to use our own DVI cable instead of the included VGA cable. Once you’ve got both the power cable and DVI/VGA cable plugged in, you’re ready to go. A blue LED will light up in the bottom corner to indicate that the monitor is currently on. You can use the other buttons just on the right to bring up the monitor’s menu.