There may be many reasons for the black screen after the laptop restarts.The following are some common causes of this problem:
1. Video card driver problem: When connecting the projector, the video card may automatically switch to the external display mode.However, after disconnecting the projector, the graphics card failed to switch back to the internal display mode correctly, resulting in a black screen.The solution is to update or reinstall the latest version of the graphics card driver.
2. Resolution setting problem: When connected to the projector, the resolution is usually automatically adjusted to fit the external display device.However, after disconnecting, the resolution may not be restored to a setting suitable for the laptop screen, resulting in a black screen.You can try adjusting the resolution settings manually or using the Restore Defaults option provided by the operating system.
3. System fault: In some cases, disconnecting the projector causes system error or crash, resulting in black screen.This may be related to operating system, hardware compatibility and other factors.You can try to solve this problem by restarting the computer.
4. Power management setting problem: Some laptops have special power management functions, which can save energy when using external display devices.However, these settings may cause a black screen after disconnecting.You can try adjusting power management settings to disable options related to external displays.
If the above methods do not solve the problem, it is recommended to further eliminate the fault by the following methods:
-Connect to another external display device (such as a TV) and check whether the black screen still appears after disconnecting. -Press F8 when starting the laptop to enter the safe mode, and observe whether the black screen still appears. -If the problem persists, you may need to contact the manufacturer's technical support or take your laptop to a professional maintenance center for diagnosis and repair.
That's because when you connect the projector, you set the projection mode to display only on the projector, or the system thinks that your projector is still connected to the computer.In this case, you can generally operate the win key+P blindly, and then enter twice to switch the display settings back to computer display only.If this method doesn't work, you'd better connect the projector back, and then win+p enter the projection option to set the computer display only, and then disconnect the projector.If you are an XP system, there should be a display setting option in the properties by right clicking the mouse desktop. You can set the projection mode.
