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Look and see if it appears as a monitor in your display settings, if it doesn't, then another good first step would be to update your video card drivers (go to this page and select "Video" then download " Intel Graphics Driver"). If none of this fixes it try the VGA cable with a different PC and see if it works.
You can try installing the Video Driver for the Windows Vista Operating System as the Drivers for the Vista should work for the Windows 7 OS. Here is the link: http://www.sony-asia.com/support/download/241989/product/vgn-cr357
I'm sorry. It is not possible to upgrade the Inbuilt Video card. However, the Computer is shipped with the Express Card/54 slot. You can contact your nearest favorite dealer to get the Express Card slot supported Video card and install in the Computer. This improves the Graphic performance.