Sony PCG-R505GCK - Manual (Page 125)

Using Computer Monitors and Projectors
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5 On the Devices tab, click either Monitor or Intel(R) Dual Display Clone,
depending on your display preferences.
T
Disconnecting a computer monitor or projector
You can disconnect the external computer monitor or projector by unplugging the
display or Monitor (VGA) cable from your computer’s port. Disconnecting the
external display when the computer is in a power saving mode (Standby or
Hibernate) may cause the computer to malfunction.
✍
You may not be able to display the notebook LCD screen and an external display or
projector at the same time, depending on the types of computer displays and
projectors you are using.
Turn on the computer after you connect the external display.