The laptop is plugged in with an hdmi cable, so the screen cannot be projected.

The notebook computer can't project the screen when the hdmi cable is plugged in, which may be due to the wrong connection between the computer and the big screen, wrong input source selection, wrong screen resolution setting, incorrect display setting, and unsupported driver.

1, wrong connection between computer and big screen.

When inserting an HDMI cable, we need to make sure that both ends of the cable are connected correctly. The HDMI cable has two interfaces, one is a standard HDMI interface, and the other is a mini-HDMI interface with a small mouth. Most laptops and TVs have standard HDMI interfaces.

If you use the mini-HDMI interface, you should use the appropriate adapter to convert the mini-HDMI interface into a standard HDMI interface. On the other hand, if an HDMI adapter or frequency divider is used, the connection may be unstable.

2. Choose the wrong input source.

When switching input sources on the big screen, if the wrong input source is selected, the projection may not succeed. For example, if you select the input source of HDMI2 on the big screen and your HDMI interface is plugged into HDMI3 port, then you can't project the contents of your laptop onto the big screen.

3. The screen resolution is set incorrectly

Sometimes, when the computer displays on a big screen, the screen resolution is not automatically adjusted, which will lead to abnormal screen display. Sometimes, the resolution may be too low, causing the picture to become blurred; Sometimes the resolution may be too high for the big screen to bear, so that the big screen can't display the whole content.

4. The display settings are incorrect.

If nothing is displayed on the big screen, it may be because your computer is not configured with the correct display settings. Under the Windows system, after connecting the TV to the notebook computer, you need to open the control panel and make some display settings, such as selecting "external monitor". If these settings are incorrect, the content will not be displayed on the big screen.

5. The driver does not support it.

If you have recently installed a new operating system or hardware device, you may need to install corresponding drivers to support HDMI output. You can try to update or reinstall the relevant drivers.