That button only appears if it can see the hifi via the network, sounds like either the Hifi is going to sleep, or the iMac or HiFi has a weak WiFi connection.
Thanks for that. I suspected that might be the case. I wonder why there is a weak Wifi connection. Sometimes it works well. Of course, the hifi is in the next room but I thought that the point of Airport Express was that a signal could be sent round the whole house. Perhaps I should take this up with Apple Care support?
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