Having read that Miracast only works over WiFi, I ensured that the wireless card in the PC is also enabled.
In my case, the PC is normally connected to my wireless router using a gigabit Ethernet cable. However, another forum suggests Miracast should work on a NVIDIA GeForce GTX 960:. Miracast: Not Supported by Graphics driver So the PC (graphics card & drivers) appear to support Miracast. Wireless Display Supported: Yes (Graphics Driver: Yes, Wi-Fi Driver: Yes) 'netsh wlan show driver' in a command window on the PC shows:. I've checked that mirroring is enabled in the 'settings' menu on the Roku. However, I have been unable to use it to mirror the display on my Win 10 Desktop to the TV. I recently bought a Roku Express for my TV.
