I just bought a Lenovo All-in-one PC and wanted to hook up my TV with ChromeCast as second monitor.
When I open settings and click "Detect" button, it only states "No other monitors detected"
It doesn't let me add my 2nd screen. Even upgraded to Win10-Pro !
Screenshot in Dutch :-)
I've done this on a laptop without any problems.
Is it due to the capabilities of the adapter AMD Radeon R4 ?