Hi there! I understand you're experiencing a black screen after trying to set the screen to "off." No worries, let's work through this step by step to get your display back up and running.

1. Check Power: First, ensure that your device is powered on. If your device is on but the screen is black, proceed to the next steps.

2. Force Restart: Try performing a force restart. Press and hold the power button on your device for about 15 seconds. This forces the device to shut down, and it should turn off. Once it’s off, wait for a few moments and then turn it back on.

3. Remove External Devices: If you have any external devices connected (like external monitors or projectors), disconnect them and then restart your computer. Sometimes, the system can get confused about which display to use.

4. Safe Mode: If the screen remains black after a restart, try booting into Safe Mode. You can do this by turning the computer on and repeatedly pressing the F8 key (or Shift + F8) until you see the boot options. Select “Safe Mode” and see if the screen displays properly.

5. Check Display Settings: If you can get to the desktop in Safe Mode, right-click on the desktop and choose “Display settings.” Make sure the correct monitor is selected, and adjust the settings as needed.

If you’ve followed these steps and the issue still persists, we may need to explore further. Would you like me to search for additional solutions online?