If your Talkie screen is darker than normal and unresponsive to touch, you can follow these steps to diagnose and potentially resolve the issue:

1. Force Restart the Device: Press and hold the power button for approximately 10 seconds until the device powers off. Wait for a moment, then turn it back on. This can help in resetting any temporary glitches, including screen brightness.

2. Check for Accessibility Features: Sometimes features like TalkBack, which aids visually impaired users, can make the screen seem darker and affect touch functionality. To disable TalkBack:
- Simultaneously press both volume buttons and hold them down for a few seconds. This should turn off the accessibility feature and restore normal screen brightness - learn more.

3. Adjust Brightness Settings: If the screen remains dark, you may need to reset brightness settings. If your device is responsive enough, try to access Settings > Display > Brightness and adjust the slider. If you can't adjust it:
- Consider moving to a brightly lit environment to help see the screen better. Sometimes, the brightness might be set to zero, appearing as if the screen is off - learn more.

4. Safe Mode: If the screen is still unresponsive, booting into Safe Mode might help. To enter Safe Mode:
- Press and hold the power button until the power menu appears.
- Tap and hold the "Power Off" option until you see the "Reboot into Safe Mode" prompt. Tap "OK".
- This will disable third-party applications and might allow you to diagnose if an app is causing the issue.

5. Check for Hardware Issues: If none of the above solutions work, you may need to consider possible hardware issues with the screen. This may require professional assistance or contacting customer support for your device.

6. Factory Reset (if necessary): As a last resort, if the screen remains dark and unresponsive, you can perform a factory reset. This will erase all data on your device, so ensure you have backups.

To initiate a factory reset:
- Go to Settings > System > Reset options > Erase all data (factory reset). Follow the on-screen instructions to complete the process.

If problems persist after trying these solutions, contacting customer support or visiting a service center may be necessary.