What does 'no VGA signal' mean?

A blank screen indicates that the computer's monitor is not receiving video signals from the VGA interface.

Here are several possible reasons for this situation:

Loose connection: The VGA cable may not be properly connected to the computer or the monitor, or there may be looseness at the connection point. In this case, you can try unplugging the VGA cable and reinserting it firmly to ensure a secure connection.

Card failure: The graphics card of the computer may be malfunctioning, preventing it from outputting video signals properly. You can try unplugging the graphics card and reinserting it, or have a professional technician inspect and repair it.

Motherboard failure: The motherboard of the computer may be faulty, affecting the normal operation of the VGA interface. This situation requires a detailed inspection and maintenance by a professional technician.

It should be noted that VGA is a data transmission standard with fast display speed and rich colors, but it does not support audio output. When dealing with the issue of a blank screen on VGA, you can check the above possible reasons and take corresponding solutions. If the problem persists, it is recommended to seek professional assistance.