Mac Book Pro, screen freezes then struggles to turn on

[NightLucidity]

Hello Forum,
Its been a while, but basically my mac book pro randomly freezes whilst I am on my computer (Mostly online). After it freezes, I have to force shut it down, and turn it back on again. However whenever I do that, turning it back on adds plenty of small horizontal lines through the logo, and after a couple minutes of loading it shuts back down. This repeats over and over again until the lines disappear and the mac boots up again. Does anyone have any clue what this could be or how to fix it?
Thank you
Night

 

[JTToft]

That wouldn't, per chance, be a 15" or 17" 2011 model, would it?

If so, see this: http://www.apple.com/support/macbookpro-videoissues/

 

[NightLucidity]

That wouldn't, per chance, be a 15" or 17" 2011 model, would it?

If so, see this: http://www.apple.com/support/macbookpro-videoissues/

Thank you, Sorry for the late response I was away for a while.
Ill try and bring it over today and let you know if it worked