They're both connected. The colors indicate 3 is on and running; 5 is recognised but not running. If there's another ... generator #4 ... that's not showing, you need to rescan via utils. If that doesn't work, shut down, unplug your usb cable, replug, reboot, launch software again. If it still doesn't recognise #4, then you should swap over your usb cable as it may be faulty.
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