Most known issues related to Amazon Fire TV, can be solved following the troubleshooting steps reported below:
As a first action, you should always restart your device, since this can resolve many issues: just disconnect the power cord (from the back of the device or from the power outlet), and then plug it back in.
If you keep seeing a blank or black screen, make sure your TV is on and set to the HDMI input channel your Fire TV is connected to. If you're using an HDMI cable to connect your Fire TV to your TV, unplug it and then reconnect. You may need to try a different HDMI cable.
Temporarily unplug other devices connected to your TV's HDMI ports.
Try changing your TV to a different resolution (e.g. 1080p or 720p). Press the Up and Rewind buttons on your Fire TV remote at the same time for five seconds. The system then cycles through available output resolutions, pausing at each resolution for 10 seconds. If you see the correct resolution on-screen, select Use Current Resolution.
If your Fire TV is connected to an AV receiver, make sure the receiver is on.
For troubles in downloading, installing, or using a third-party app, try these steps:
Select Settings > Applications > Manage Installed Applications from the Fire TV menu.
Select the application you're having trouble with. You can then:
Clear the cache and/or data, which often resolves intermittent performance issues. Clearing data doesn't delete the app itself but may delete saved information (like account details or game scores). Change available settings for the app.
For Amazon Fire TV devices, you have an option to move the app between internal and external storage.
Force stop the app and then uninstall it.
If you're having trouble with audio or you're seeing video with no sound, try these steps:
Make sure the audio on your TV isn't muted. If your Fire TV is connected to an AV receiver, make sure the receiver is on. Select Settings > Display & Sounds > Audio from the Fire TV menu, and make sure Dolby Digital Plus is set to OFF. If you're using an HDMI cable to connect your Fire TV to your TV, unplug it and then reconnect. You may need to try a different HDMI cable.