Sony PCG-SRX87 - Manual (Page 61)

Connecting an External Display
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See the manual supplied with your projector for more information on its installation
and use.
You may not be able to display the computer’s LCD and the external display together,
depending on the specific computer display or projector used.
Connect the AC adapter after you finish connecting all other peripheral devices. Turn
on all the peripheral devices before you turn on the computer.