Screen flickers and goes black on boot up.

Have an older white MacBook that when I boot up, screen flickers and goes black, MacBook does power on.
Any suggestions?

I am seing a similar issue with a 13" White MacBook.
Powers on ... chimes ... then screen goes blank as if the machine has gone to sleep. Hitting the Return key or the power button wakes it again, but only for two seconds ... and repeat!
Any help gratefully received!
Chris

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    About 6 months ago, the HP display started going white and sometimes gray for a few seconds before the image would return, and a couple of times I had to unplug it and restart the Macbook before it came back.  I followed Apple's instructions for testing whether the problem was in the computer  (= resetting the system by resetting the Mac's parameter RAM and SMC), but the computer tested okay.  I then purchased a new VGA cable and DVI-mini connector, but the problem persisted. 
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    Hello @turtlewiz,
    Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
    I understand that your HP V17 Monitor has gone black and is not displaying anything. I am providing you with some steps for you to try below:
    Step 1. Unplug the power cord from the back of the monitor and the wall
    Step 2. Hold the power button down for at least one minute
    Step 3. Plug the power cord back into the monitor and then into the wall outlet (not a power bar or surge protector)
    Step 4. Press the Menu button on the monitor
    Step 5. Navigate to the Factory Reset option and select it
    If the issue persists after this you can try the monitor on another computer to see if it continues. If it does it appears to be a physical issue and I think it would be best if you contact HP Technical Support for repair options.
    Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
    Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
    Dunidar
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    Message was edited by: U Can Call Me Al
    Message was edited by: U Can Call Me Al
    Tried to delete this post since it is doubled but no luck.

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    Message was edited by: U Can Call Me Al

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    When I open my laptop, the screen flickers for less than a second and then goes dark. If I open and close it quite a few times, occasionally the screen will work, for hours at a time. If you shine a flashlight on it, you can see the dim desktop, so I know the computer is running. It is a mid 2010 macbook pro.
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    Check out Apple's Special Financing link.
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