820-00045-a cpu issue??

I have a 12" retina that will give distorted screen when its turned on, when its turned on, screen will be fine until loading bar comes up, and then screen went all distorted like it have a gpu issue, its not a screen issue as it just stucks at apple logo when it happens.
is there any way to fix it? Or just a trash?
 
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Installed new os and it started working fine, which is strange as it was having same issues while running hardware test. Made me look like an idiot in font of my boss and colleague
 
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