MSI CX420 User Manual page 77

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Connecting the External Display Devices
This notebook provides a VGA port for connecting a larger display with higher resolution.
The 15-pin D-sub VGA port allows users to connect an external monitor or other standard
VGA-compatible device (such as a projector) for a great view of the notebook display.
To connect the external display, make sure the notebook and the external display are both powered
off, and then connect the display to the notebook.