Fn+F7 Toggles the display between the computer screen (LCD), a connected external display, and both the LCD and an
external display.
Select one display when playing a DVD. Connect the cable(s) before you turn on the computer; otherwise, Fn+F7 will not
work. You cannot use the Fn+F7 function to switch between the LCD and an external display once a DVD is inserted into
the optical drive.
Below is the link to the user manual for your notebook.....
http://www.docs.sony.com/release/PCGGRT250.pdf
I'm having a similar problem. I tried removing and replacing the RAM, and that didn't work. I have a Radeon Graphics card installed and I tried plugging the monitor cable into the Radeon card AND the factory installed video card - neither one solved the problem.
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