How do I make my kindle fire screen brighter?

Maybe the Kindle is frozen on that screen. The Kindle HDX User Guide suggests a hard reset by holding down the power button for 20 seconds before releasing it. That should shut the Kindle down. Be sure to not have the Kindle on a charger or hooked up to a USB cable during the hard reset. Next restart the Kindle. If that fails then charge the Kindle as you would normally do and when done detach the charger and USB cable and try another hard reset. If all fails go to www.amazon.com/kindlesupport.

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Restarting Kindle Fire may resolve intermittent issues like a frozen screen, battery issues or trouble downloading content to your Kindle Fire.
To restart your Kindle Fire, press and hold the power button for 40 seconds and then release. After the device has completely turned off, press the power button to restart your Kindle Fire.
If your Kindle Fire is still unresponsive, try charging your Kindle Fire before trying to restart the device again.
Make sure you have the latest software version available installed on your Kindle Fire. The latest version is available at www.amazon.com/kindlesoftwareupdates

"Performing a hard reset on your Kindle Fire may resolve intermittent issues like a frozen screen, battery issues or trouble downloading content to your Kindle Fire. Allow your Kindle Fire to charge for approximately 30 minutes, then try the following steps.
To perform a hard reset on your Kindle Fire, press and hold the power button for 20 seconds and then release. After the device has completely turned off, press the power button to restart your Kindle Fire.
If your Kindle Fire is still unresponsive, try charging your Kindle Fire before trying to reset the device again." from here. Hope this helps, good luck.

1 Connect the Kindle Fire to your computer using a USB cable.
2 Wait for your computer to recognize the Kindle Fire device, and select the option that allows you to view the contents and data stored on the Kindle Fire.
3 Copy or move the Kindle Fire files you want backed up over to your computer's desktop or other location.
4 Right-click on the icon for your Kindle Fire located on your computer's desktop, and select "Remove" or "Eject."
5 Remove the micro-USB cable from your Kindle Fire. After you reset your Kindle Fire, you can follow these same steps to move your saved files back to the Kindle Fire from your computer.

Part 2 Reset the Kindle Fire

1 Tap on the "Quick Settings" icon on your Kindle Fire. The icon is shaped like a wheel, and is located in the status bar at the top of your Kindle Fire.
2 Tap on "More."
3 Tap on "Device."
4 Tap on "Reset to Factory Defaults."
5 Tap on "Erase Everything." Your Kindle Fire will reboot, and display a message that confirms the reset process.

When the Kindle Fire has finished resetting, it will reboot once again, and display the initial start-up screen.

Note: Your Kindle Fire lock screen password or PIN is different from your Amazon account password.
Reset Your Kindle Fire Reset your Kindle Fire if you forgot your lock screen PIN or your parental controls password and need to regain access.

If you have any content not saved in your Kindle Library in the Cloud, be sure to transfer that content from your device to your computer via USB.

Important: Resetting your Kindle Fire will remove all content downloaded to it. Any content you purchased from Amazon is saved to your Kindle Library in the Cloud and will remain in the Cloud. You can download that content again if you register your Kindle Fire to your account again.

1. From Home, swipe down from the top of the screen, and then tap More.
2. Tap Device.
3. Tap Reset to Factory Defaults, and then tap Erase Everything.

Your Kindle Fire will restart.

To use your Kindle Fire again, you'll need to connect wirelessly and register your Kindle Fire.

If you can't remember your lock screen password or PIN, you will need to reset your Kindle Fire.

Important: Resetting your Kindle Fire will remove your personal information (including your lock screen password or PIN), Amazon account information, and downloaded content and apps. Any content you purchased from Amazon is automatically saved to the Cloud. You can download that content when you register your Kindle Fire to your account again.

1. From the lock screen, slide the Unlock Bar from right to left.
2. Enter characters into the prompt ten times. You will receive several warning messages. Dismiss the warning messages, and continue entering characters into the prompt.

After you've entered the incorrect password or PIN ten times, your Kindle Fire will reset.