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I have an early 2011 15" Macbook (2.4 GHz i7)

The laptop boots fine, but

  • after 10 to 20 minutes of regular use the screen either goes blank, breaks off into multiple lines, goes dark or just freezes the image
  • one or two minutes after that happens it reboots
  • If I connect the HDMI connector this happens in less than 5 minutes.

Ive run all the hardware diagnostics including memory tests and it says everything is fine.

Can I change just the GPU or do I need to change the whole logicboard?

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What are the symptoms? Does it boot but fails to display an image? Doesn't it start at all, ... ? –  Hennes Apr 16 '13 at 14:49
    
@hennes just updated the description –  amhed Apr 16 '13 at 15:06
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