Black screen one beep

Black screen one beep Hi I have a Macbook pro I am getting power however the screen is black and i am only getting one beep every 5 seconds. I can not find any information for one beep.
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bert [Entry]

"First try the following: Resetting NVRAM and PRAM

If that doesn't help you may have a memory issue see this TN: Beep error codes"