Macbook não lê HD interno, somente através da porta USB

Meu macbook pro não inicia o sistema pelo HD interno.
Se eu tirar o HD e colocar na porta USB ele funciona.
Com um outro HD com o sistema inserido pela USB eu consigo ler os arquivos do HD interno, porém ele não não inicia o sistema

I do not have a good answer for you.
If both hard drives will boot the Mac connected by USB, then the hard drives are good.
If they will not boot the Mac when installed inside, the SATA cable is usually the problem.
If one hard drive is inside and you boot with the other that is connected via USB, I would think that the internal drive could not be accessed.
I am guessing that the circuitry permits access but is separate from the boot function?
The best option is to go to an Apple store or AASP and have then evaluate it.
You might run an Apple Hardware Test and see if that provides a clue:
http://support.apple.com/kb/ht1509
Ciao.

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