Fn + F4.
Or it might be different. Look for a function key with a box and lines on its side. Hold down Fn key and press that function key.
If you connect the projector to the laptop and power up the projector first and then the laptop, the video data will automatically divert to the video port/projector .
On most Presario press the Fn key and the F4 key The function key will have a screen symbol printed on the key.
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