VIEWSONIC XG2560 25" 16:9 LCD Gaming Monitor - Manual (Page 20)

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2-5. Power On
Turn On LCD Monitor and Computer
Turn ON the LCD Monitor, then turn ON the computer. This
particular order (LCD monitor before computer) is important.
2-6. Driver Installation (Windows 10 Setup)
In order to install the driver, first connect your monitor to your PC,
boot up your PC (make sure to first turn on the monitor first) and
make sure your internet is available. When the PC has finished
booting up, your PC should auto- detect the monitor.