1、 It may be that the performance of your graphics card is not enough, and you can't bring an external display, especially a large screen, high-resolution display
2、 It may be that your monitor itself is a little bit. Now many monitors have some shadow when playing high-speed action. If it is not serious, you can not care too much
3、 There is a problem with the connection between the laptop and the monitor. You just need to borrow a friend's cable to try
4、 The socket of the laptop and the monitor may not be in good contact. Unplug the cable and plug it in again
