External monitor black flashes

Anyone experiencing black flashes on external monitor? I'm using a Dell P2414H connected to a retina macbook pro late 2013 via displayport.
Thanks for replies.

Hello, Spinnn. 
Thank you for visiting Apple Support Communities.
Try the troubleshooting steps in the article below.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Cheers,
Jason H.

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    http://support.apple.com/kb/ht1573
    Thanks for being a part of the Apple Support Communities!
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    Hi Goloono,
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    I work on behalf of HP
    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
    Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

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