How to fix a black screen on Linux preventing access to the system?

If you encounter the issue of a black screen on Linux and are unable to access the system, you can try the following methods to resolve it:

1. Confirm hardware connection: Check if the computer’s power, monitor, and data cables are properly connected to ensure there are no loose or damaged connections.
2. To restart the computer: press and hold the power button for 5 seconds, then release it, wait for the computer to completely shut down before restarting it.
3. Enter recovery mode: press Ctrl+Alt+F1 during start-up to enter recovery mode, then attempt to repair the system.
4. Force close the X window: Press the Ctrl+Alt+Backspace keys during startup to force close the X window, and then restart the system.
5. Check the graphics card driver: If you have recently installed or updated the graphics card driver, it may cause a black screen issue. You can try uninstalling or downgrading the graphics card driver, then restart the system.
6. Repair damaged file system: If your file system is damaged, it could result in a black screen issue. You can boot the system using a Live CD or USB, and then use the fsck command to repair the file system.
7. Check the log file: You can examine the /var/log/Xorg.0.log file for additional information about any errors that may occur during the X server startup process.

If you have tried the above methods and are still unable to solve the problem, it is recommended to seek help from the Linux community or technical support, as they may be able to provide a more professional solution for you.