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Internal Hard Drive not showing up

I used an iFixit kit and great instructions to replace the CD drive with a SSD a couple of years ago in my son's laptop and it has been working fine. I don't know if it became overheated, electrocuted or what but when he came back from school the whole system was near death - can supply further info. if needed, but 'near death' sums it up.

I managed to wipe and rebuild the SSD and get that back working properly but the internal HD (500Gb) just wouldn't show up. The MBP works fine without it, quite quick in fact as the OSX is on the SSD.

I took the HD out and put it in an external enclosure, got it to appear, reformatted it etc. and that now seems to work fine as well on its own. But not when it's back in the MBP. I can hear it spinning up so it's getting power, but it still won't appear as a volume on the desktop, in the System Report or in any diagnostic utility.

All the ribbon connections seem fine and there are no other problems. Where do you think the fault lies? and is it worth fixing, now it's out of Applecare period?

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I had to take it into Apple in the end. The drive was fine - as I suspected - but one of the connecting cables was not. In effect, it was receiving power but not interfacing with the internal data buss.

I can't imagine how this kind of faulty could develop, but it did, and they charged less than 30GBP to replace it - one of the rare occasions when Apple service seemed quite reasonable.

Thanks for your suggestions.

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Check the format of the drive to see if it is GUID and Mac extended. A master bot block drive can be seen in an external but not internally,

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if hard drive is working as an external and its not working internally when connected. they it is you hard drive cable.

if you are talking it doesn't read it in the caddy then that will need to be replaced.

maybe time machine you ssd to ur hd.

and boot between them to check

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Iain Boyd 가/이 대단히 고마워 할 것입니다.
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