I have a Lenovo laptop running Windows 7 prof. I also have a Samsung Galaxy tab 2. The Chromecast is up and running just fine on the tablet and my wi-fi network. The laptop runs on the same wi-fi network. After setup, etc on the laptop, there is no Chromecast icon in YouTube. In the Chrome browser, the icon is there, but I get No Cast Device Found. I've verified that I have up to date software versions. I also have the Chromecast extension added to the browser. Any suggestions for me? I'd appreciate any ideas you have! Thank you!