Inspiron 24 5475 may show that Miracast does not function and the message appears on screen. A black screen may also be noticed on an external monitor.
The message reads: Your PC or mobile device doesn't support Miracast, so it can't project wirelessly.
The Inspiron 24 5475 does not support the Miracast function.
Use the HDMI output for an external display if you require a second monitor for the display.