Sort the macbook pro screen problems?

MacBook Pro 15 inch end 2011, 2.2 GHz Intel Core i7, 4 GB 1333 MHz DDR3, AMD Radeon HD 6750 M 512 MB.

El Capitan 10.11.3 OSX

So a week ago, I got my board logik replaced under the scheme where Apple do for free and when I got back that I updated the OS to El Capitan, and since then, my macbook was restart itself after the screen messes up, as there lines horizontally will go across the screen, the screen turns blue with vertical lines or he'll usually scrambled and the right part of the screen is on the left and the left side is on the right. This happens usually when I watch shows online, I bought a new external hard drive yesterday to replace my old and I did a full backup time machine, which took about 6 hours, I left alone and did not touch my MacBook all the time so he was backing only, and so it didn't plant once then when I look at something online it could crash a couple of times in an hour. It happens on safari and chrome.
Guidance on how I can resolve this issue? I plan to do a clean install of El Capitan, I know that it is usually a last resort, I already have the stick bootable installation, I was wondering if anyone had any idea what to do?
Thank you very much

Bring the MBP and checked it.  It is indicative of hardware problems, not software.

Ciao.

Tags: Notebooks

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