Using The On-Remote Help; Logitech's Harmony Remote User Forums - Logitech Harmony One User Manual

Using the On-Remote Help

When one or more of your devices don't power on or off, or when they don't switch inputs
correctly, you can use the Help button on the remote for simple troubleshooting. Answer
the questions on your Harmony One to re-synchronize it with your entertainment system.
See Using the Help button.

Logitech's Harmony Remote user forums

You can also access the user forums to see what other users like you're discussing. Simply
go to http://forums.logitech.com/.
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