HT201364 My computer won't show any display!

I've got a macbook pro and when Mavericks came out I upgraded to it and all was fine but yesterday my mac told me there were new updates to be made on my mac so I let it upgrade all the new updates on Mavericks.Now when I try switch on, my screen remains black but it makes the start up noise and is fully charged and the hearbeat light is full on - what's happening? what should I do?

Reset the System Management Controller
Reset your computer’s PRAM

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