Chromecast not working? Now you can complain in an official place on the web – a Googler might even see and help you out. The official Chromecast product forums are up and running with plenty of general information and threads with specific questions.
The landing page for the forums has links to some general how-to content – setting up the Chromecast, apps, and so on. There is also a thread in the product forums with the 12 (supposedly) most frequently asked Chromecast questions.
The threads can be sorted by category or date. There are already a few dozen threads to search for answers to your problems, or just start a new one.