Cant find internal HD, but nothing wrong with HD or connectors.

Apr 6, 2015
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At startup, my macbook suddenly cant find my internal HD, i get that grey screen with the question mark. When i replace it with a new internal HD the macbook finds it, so there shouldn't be anything wrong with the computer or the internal connectors.

Here is the strange thing: When i connect the original internal HD through USB it works fine.
Ive repaired permissions through disk utility and ran it through disk warrior. Still the same problem.

Anyone know what the problem is here?

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