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You'll need a phone, tablet, or laptop computer to set up Chromecast. You can set up Chromecast by first navigating to cast.google.com/chromecast/setup. Tell us a little more about where you're having trouble:
Please note: You may need to change your router settings before Chromecast can communicate with your network. Please refer to the Chromecast router compatibility page for more information.
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Please note: The Google Cast extension is available on all platforms, including Chrome OS, Windows, Mac OS X, and Linux. There are no specific hardware requirements in order to install or use the Google Cast extension, however some device configurations will be better suited for casting a tab than others.
Tell us a little more about your issue casting from youtube.com or learn more about casting a tab.
Please note: Guest mode can be set up (or turned on) on any device that supports the Google Cast app. Guest mode can be used for casting as a guest on Android 4.3+ or iOS7+ devices.
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Which error message do you see displayed?
I have a question that doesn't fall into the above categories: