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If you have and there is still nothing on your Projector - do the following :
Right click on your desktop and go to properties , then select settings and check if your Notebook's resolution is supported by your Projector i.e. XGA ( 1024 x 768 ) or SVGA ( 800 x 600 )
Then check if your secondary screen is activated ( it will read attached ) Once this is done close the window and hold down the Fn ( function ) button which is located just left of your spacebar and in your F-row of buttons the one with a screen on it ( differs from brand to brand )
not all computers are F4 - some are F7... - If there is not a small graphic on each Function button - just press and hold your function button and I'd start with F3 then F4 then F5 and so on - often your image will appear on the projection screen and disappear from your laptop - just re press Function and the appropriate key - you may also need to change your display - go to your control panel then display then settings and you will want 1024x768 - as far as cables you will need a male VGA that will plug into (usually blue) connection on your laptop and then depends on what type of projector you are using - it may take a VGA or RGB (5pin cable ~ red green blue horizontal vertical) make sure that in your menu settings that you have it set to the same as the input you have plugged into