Troubleshooting External Displays - Sony VGN-U750P VAIO Read This First Manual

✍
Under certain circumstances, you may not be able to display the computer LCD
screen and a projector at the same time.
✍
You can toggle the output between the computer LCD-screen and the projector by
pressing the

Troubleshooting external displays

I cannot display contents on two or more displays at the same time
You cannot display contents on multiple external displays at the same time.
Select one of the external displays.
button on the port replicator or the display/LAN adapter.
100
Connecting peripheral devices