Hat geantwortet auf: Head piece broke and want to replaceYou can easily replace the headband with another. This is a link to the replacement guide for redoing the headband.
Hat geantwortet auf: Right side speaker has no soundThis is the link to the troubleshooting page. According to it you may not being getting power to it or it may need to be replaced.
Hat geantwortet auf: Why will my device not turn on?There could be several reasons for this. The most likely cause could be a bad battery. Here is page that may be able to better answer your question.