Nothing display out after i connect

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Hello,

i have connect my projector to my pc, and nothing come out after i switch mode.
i have tried (fn + F8) in my pc but it jus don't work as well.. it was alright all the while, but i accidently press a wrong button when i switch back from monitor to pc. and i become like that. can u help me solve this problem!

Thanks alot!!!

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Did you use the correct function key to activate the vga port on the laptop?
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You have to match the display size of the laptop screen to the projector. If you have a projector that only has a max of 1024X768 and your laptop is a wide screen then the projector will not handle the video input. You will need to change the laptop screen resolution to match the projector.

Good Luck
I connect my laptop tp projector but the message show no signal .can u help me