Dell U3821DW 37.5" 21:9 Curved IPS Monitor (Silver) - Manual (Page 34)

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Setting up the monitor
3. Plug the power cables for your computer(s) and monitor into a nearby outlet.
*When connecting two computers to the monitor, configure the USB settings from
the OSD menu to share a single set of keyboard and mouse connected to the
monitor between two computers. See
USB and Setting the KVM switch for
details.
4. Turn On the monitor and the computer(s).
If your monitor displays an image, installation is complete. If it does not display
an image, see
Common problems .
a. Connect one computer
b. Connect two computers