When I press the play button on Pandora, nothing happens. I don’t have a subscription. I can use remote to switch stations and everything, but at play I get the tone, but then just sits there.
When problems are confined to a particular channel, it may be that the channel didn't install properly, that it didn't update correctly, or that the installation has otherwise gotten corrupted. A reinstall may fix the problem, so give it a try.
Remove/reinstall procedure:
If the problem persists at this point, it typically means the current version of the channel app has a problem that must be addressed by the channel itself as they are the ones that create the Roku-compatible version of their app and provide it to Roku.