Flickering Grey / White lines across browser when video/animation is being played

Hi,
For a while now i've been getting these flickering grey/white lines across my browser, usually only noticeable when a flash animation, video or embedded advert is being played on the page. I only ever seemed to notice it happening when using Google Chrome, and a few tips suggested disabling one of the Adobe flash plugins on chrome. This seemed to fix the issue, until recently it came back again.
I decided to try and reinstall Chrome, which is when i noticed the issue happening in Safari too, which made me believe that it wasn't a browser problem but my Mac itself.
The lines seem to appear quite intermittently and only when a video or animation is being played.
Another thing i should mention is that i've not yet noticed this happening when watching video directly from my hard drive, it only ever seems to happen when i'm streaming online e.g. youtube, netflix etc But with the likes of netflix, it stops happening when i'm in full screen?
I'm currently using a Macbook Pro Mid 2010, OS X Mavericks 10.9.3. I also had the Logic Board replaced under a year ago due to other issues.
I also use dual monitors, My macbook pro and a Dell 27" IPS monitor. The flickering lines appear on both monitors, so it shouldn't be a display issue.
Below is a link to a video of the issue i'm having whilst i was visiting youtube:
http://youtu.be/En9zFT1HQ6I
Any suggestions to fix this would be appreciated,
Thanks,
Marie

I have also been having this problem. I recently bought a new iMac to relieve this aging computer, and kept this guy as a backup. I wiped the computer and installed Mavericks, and this problem keeps coming up. I have almost nothing on this computer... which is why I have no idea why it's having issues. The extended hardware test also shows nothing. Also tried resetting PRAM/SMC, which seems to make it go away for a little while.
Before I reset and upgraded to Mavericks, I was having another weird graphics issue where things would fragment and freeze either momentarily or permanently until I restarted. This mostly happened while I was using Skype. I brought it into the Apple Store several times but they apparently could never re-create the problem... I have a feeling these are related. I'm afraid the graphics card is failing and of course the warranty has run out.

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