Fix Black Screen On Fire TV Stick

If yourAmazon Fire TV displays normally but you aren’t able to use any controls, first try troubleshooting the remote. For more information on troubleshooting the remote, go to Can't Pair a Fire TV Remote or Game Controller.
Restart your device. Disconnect the power cord from the back of the device or from the power outlet, and then plug it back in.
You can also use your remote to restart your device. Press and hold the Select Select Button
and Play/Pause Play/Pause Button
buttons at the same time, for about five seconds. Or, select Settings > Device > Restart from the Fire TV menu.

Make sure that you are using the power supply provided with your Amazon Fire TV device. Connect the included power adapter into the power port on the back of your Fire TV, then plug the other end into a power outlet.
For Amazon Fire TV (1st and 2nd Generation), make sure that you are using a High Speed HDMI cable, if needed. The cable should say "High Speed", "1.3", or "1.4" on it. Plug one end of your HDMI cable into the HDMI port on the back of your Amazon Fire TV, then plug the other end into an available HDMI port on your TV. For Fire TV Stick, make sure that you use the included HDMI extender.
If you are using an HDMI hub, disconnect your Amazon Fire TV device from the hub and try plugging it directly into the TV.
Try switching to a different HDMI port on your television. Remember which HDMI port you used to connect your Amazon Fire TV device and switch to the corresponding input channel on your TV.

A number of scenarios may yield a frozen fire stick. And just what screen is visible during the freeze is sometimes relevant. Other than a reset procedure, you can also consider the scenarios mentioned on the following page:

Solved Amazon Fire Stick Black Screen Frozen updated 2018

Here is a discussion of the reset process:

How to Reset Your Amazon Fire TV
This generally involves pressing select and start simultaneously and after a restart, unplugging and re-pluging the power cable after a brief delay.

possible network or wifi corruption. try to reconnect and then reset amazon

Restarting your device 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. You can also use your remote to restart your device. Press and hold the Select and Play/Pause buttons at the same time, for about 5 seconds.

Amazon.co.uk Help: Basic Troubleshooting for Amazon Fire TV

https://www.amazon.co.uk/gp/help/customer/display.html?nodeId=201452570 Amozon fire stick not working Google Search

Check this first:

• Connect your Amazon Fire TV device to one of these network or router types:
  • Open, WEP, WPA-PSK, and WPA2-PSK encrypted networks
  • B, G, and N routers on 2.4Ghz
  • A and N routers on 5Ghz
  • Hidden networks
• Enable wireless connectivity on your Amazon Fire TV device. From the Home screen, select Settings > System > Wi-Fi.
• Make sure you know your network password (if required). If you see a lock icon, a network password is required. This password is not your Amazon account password.
• Make sure your Internet connection is not down. Restart your router and modem to solve most Wi-Fi network issues.
• Do not place your wireless router or Amazon Fire TV device in a cabinet, as it impacts your Wi-Fi signal strength.

Also, try this for Fire TV Stick:

• Use the included HDMI extender to optimize the location of your Fire TV Stick. The HDMI extender can improve your wireless connectivity by positioning your Fire TV Stick further from the TV.
• Plug the power cord into the included power adapter and then into a wall outlet to ensure the device receives enough power for optimal performance.

Still having trouble?

• Restart your Amazon Fire TV device. Disconnect the power cord from your Amazon Fire TV device for three seconds, and then plug the power cord back in.

Tip: You can also restart your Amazon Fire TV device with your remote. Press and hold the Select button and the Play button at the same time until the Amazon Fire TV device restarts (about five seconds). Or go to Settings > System > Restart.