crwdns2934241:0crwdne2934241:0 Rolando Alvarado

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Why is my SSD not being recognized to boot up?

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I recently upgraded my SSD and used an external card reader to install the new OS on it because my MacBook Pro was not detecting it. I tried a new SSD tray and still not reading it. What would be my next step? I connected the SSD to my other MacBook using an external reader and it works with no issues. Any help is greatly appreciated.

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MacBook Pro 13" Retina Display Early 2013

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open