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How do I isolate the problem with my logic board?

I have a 2006 macbook pro, and over the many years it slowly started to overheat until the typical GPU problem kicked in and the screen became fractured and the computer unusable. I baked the logic board, and it worked again, but only for a couple of months before the same problem repeated.

So I baked it again, applied Arctic Silver 5 thermal compound, and upon turning it on again, the hard drive would make mounting sounds and within 5 seconds the fans would be going at full speed, but nothing more. The display would show nothing and I would hear no chime.

I figured the board had had it, so I ordered a replacement from a 99.7% rated seller on ebay with tens of thousands of feedback points.

Upon installing the new one, I turned it on and had the same result. No display, no post, and high speed fans.

So now I am thinking that either this logic board is a dud too and I need another replacement, or that there is something else wrong with my computer other than the board.

Problem is, I can't imagine what else it could be.

Does anybody have any advice for me?

Answered! View the answer I have this problem too

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Recheck all your connections - logic board swaps/removals are major projects. If you have damaged cables or connections the behavior you describe would result.

After you're 100% sure things are right on your end, talk with your vendor… the logic boards are recycled and damage could have occurred at removal.

If this answer is acceptable please remember to return and mark it.

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