First, before shutting down the computer, it is recommended to close all open programs and kill viruses, then turn it on again and then turn it off normally for testing;

2. If the computer crashes when it is turned off, you can try to forcibly turn it off, that is, hold down the power switch button for more than 5 seconds until the computer is turned off;

3. If the computer equipped with Win 10/8. 1/8 system is turned off, and the display screen is black, but the host power light is still on, that is, the computer cannot be completely turned off. The following are the solutions:

1. Turn off the Enable Quick Start option;

(1) Click Open on the Start menu, and then select Settings and Select Open to enter here;

(2) In the setting window, we click System Display, Notification, Application and Boot here;

(3) Click Power and Sleep on the left, and click Open, as shown. Then click other power settings options;

(4) In the power options window, click the Select Power button on our left to open it;

(5) Here we choose to change the settings that are currently unavailable, as shown in the figure, and click.

(6) Shutdown settings are here. We will enable Quick Start to cancel the previous check and save the settings.

(7) Note: The above phenomenon only exists in notebook computers, because desktop computers cannot directly control the screen power supply.

2. Uninstall and update the computer's graphics card driver;

(1) Right-click the desktop pc, select Properties, and open the device manager on the left;

(2) Right-click the graphics card, and then select the uninstall button to uninstall the current graphics card driver;

(3) When confirming the unloading of the equipment, we check here to delete the driver software of the equipment and confirm;

(4) After uninstalling the driver, we reinstall the driver with the driver CD, or download the corresponding graphics card driver from Lenovo Commercial Service official website for reinstallation.

3, killing computer viruses, eliminate viruses.

If the above scheme is invalid, you can use anti-virus software to thoroughly disinfect the computer to eliminate the situation that the computer can't be turned off because of the virus, so that the shutdown problem can be basically repaired.

4. If the above scheme is invalid, go to the homepage of the avatar and click online consultation.