A black screen on your computer but still showing the mouse pointer is usually a sign that the operating system is experiencing a problem, but it hasn't crashed completely. To solve this problem, you can try the following steps:
Force restart
Try using a keyboard shortcut like Ctrl + Alt + Del to see if you're able to bring up the Task Manager or restart options.
If there is no response, press and hold the power button until the computer turns off, then turn it on again.
Safe mode boots
If normal startup still fails, try starting your PC in safe mode. Safe mode loads only the most essential drivers and services.
In Windows, you can press the F8 key several times during the boot process (this may vary from computer to computer) to enter the "Advanced Boot Options" and then select "Safe Mode".
Check the display settings
If you've recently changed your display settings or installed a new display driver, this could be the cause of the problem. In Safe Mode, try restoring your old display settings or uninstalling a recently installed driver.
System Restore
If your computer boots up normally in safe mode, try using the System Restore feature to roll back to the previous restore point.
Check for hardware issues
Verify that all display-related hardware, such as the monitor, cable, and graphics card, is properly connected and not damaged.
Update or reinstall the graphics driver
In Safe Mode, try updating or reinstalling the graphics driver.
Scan for viruses and malware
Use antivirus software to check for viruses or malware that are causing your system to crash.
Check the system files
Use the System File Checker, such as running at a command promptsfc /scannow) to repair corrupted system files.
Professional help
If none of the above steps resolve the issue, you may need professional technical support. Consider taking your computer to a professional computer repair shop for inspection and repair.
As you go through these steps, make sure to make the appropriate adjustments for your operating system and PC model. If you're unsure about a certain step, it's best to seek professional help.