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Any contemporary monitor is able to switch analog/digital mode automatically if connection from signal source to monitor is set up properly.
Connect digital output from your graphic card to DVI input of the monitor. Disconnect any other signal cables from monitor and switch on both devices (PC & monitor). Wait a while. Monitor checks its inputs and a activates digital DVI, because it is only one active input on it.
If none picture excluding error message of monitor is displayed, go through these steps: 1) Check whether your monitor is set for automatic input selection. If monitor buttons have no response try to use analog input to activate screen (any picture, desktop background...) and then get monitor menu access by pressing menu button.
2) Find out what connector type has your graphics card in PC. Possibilities are: DVI, HDMI, DisplayPort and some their options. See Wikipedia for connector look if you are not sure. Remember that blue D-SUB (VGA) connectors are analogue and you cannot activate digital mode through analog VGA cable.
3) Use appropriate cable to connect monitor to PC. Example: Your PC has HDMI output. Use HDMi-to-DVI cable. Your monitor input is DVI and common DVI-DVI cable is not suitable in case you have PC with the HDMI. Note that DVI-to-DVI, DisplayPort-to-DVI etc. cables are available. You must buy right one.
Be aware that "Auto" button is inactive in digital mode of monitor.
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To clarify, you know that analog is referring to the VGA 15 pin video input, and digital is referring to the DVI video input, right? You can't have the digital video unless you use the DVI input, which requires a DVI output from your computer (and a DVI cord of course).
If you already knew this and you mean that it won't switch over to your DVI, then there could be several problems. Most of them being with your DVI signal source (computer). Try booting the PC with ONLY the DVI cord attached between the PC and the monitor. If you have a VGA cord plugged into either, UNPLUG IT FROM BOTH ENDS.
First and simplest is to simply shutdown the pc, disconnect the analog from the back of your PC and connect the DVI cable to the PC and monitor. When you turn it back on the PC will detect and switch to the DVI.
Second, and better to compare. Connect both sets of cables and go into your display settings, then select advanced options. You should see a GeForce tab in the advanced menu. On that tab there is a multi monitor display setup. Set it to mirror to both screens and apply.
Once it's set switching inputs on the monitor SHOULD work. The problem that makes it a "should" is that both the monitor and the video card have the ablility to sense a connection. So, even with mirroring setup you may have to use the first method as you can't have both connected and operational at the same time.
Give these a try, if you're not sure how to get into the display settings, comment back here with your windows version and I will give you a step by step
THE ONLY WAY THIS WILL CHANGE IS IF YOU HAVE A DIGITAL INPUT SOURCE CONNECTED to this mointor like HDMI AS THIS MOINTOR AUTOMATICALLY SENSES ANALOG SIGNALS AND DIGITAL INPUT SIGNALS if a digital signal is available it will switch over if a digital input singal is not available you will only be able to use the analog option