The LED light ring on the Highfive device can tell you what the device is doing. Here's a key to help you understand what state your device is in:
No lights: If the device is receiving power and the idle screen is displayed on the TV, this means the device is not in actively in a call.
Stationary purple/blue lights: The device is actively in a call OR is going through it's initial boot phase. If brand new, the device is waiting to be provisioned.
Rotating purple/blue lights: Software error that is coupled with an error displayed on the TV (Example: "Unable to connect to Highfive servers" error seen on TV screen) OR the device is in the process of starting up.
Solid red: Hardware error. Please contact firstname.lastname@example.org to report the issue.