Macbook pro unibody doesn't recognize hdd, is it cable or motherboard?

Hi,
A few weeks ago I replaced my hdd in my macbook pro 13inch med 2010 with a ssd. Some weeks after I did it, my macbook didn't boot up anymore, it showed a flashing folder. I put my old hdd in and it still doesn't boot up. I use my macbook now by booting from a external harddrive through usb.
However this makes the laptop much slower so I want to fix the problem. My problem is: how do I know if it's the cable from hdd to motherboard is broken or the connector on the motherboard itself is broken?
Hope someone can help me out,

Aahh, so DiskUtility does not see the HDD that is inside at all? That means trouble: either the HDD inside is dead, but probably the cable inside is not connected correctly or is damaged (or you forgot to connect a cable).
I suppose that you wanted to change the HDD with the SSD, and that you have cloned the HDD to the SSD (while externally), then after a while the MBP did not start tanymore form the internal (SSD) and you switched them again, and it still does not start from the internal (HDD), but it will from the external (SSD).  The MBP starts from the SSD (outside), so that is OK, but the HDD inside is not recognised anymore.
-hanging question: What OS do you run (you have 10.0.x indicated)?-
I deduct that it is either a loose connection or a damaged connector inside.
To be sure you could switch them again and see if the MBP starts from the outside HDD (if not, and it starts from the inside SSD, the HDD is wrong), but I guess that then the MBP will not switch from the inside disk either.

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