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Double-check that it's all connected properly. That means open up the bottom again, unplug the ribbon cables to the new SSD, and plug them back in carefully. Good luck.
 
Double-check that it's all connected properly. That means open up the bottom again, unplug the ribbon cables to the new SSD, and plug them back in carefully. Good luck.

Just did that, and unfortunately it's still not popping up.
 
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