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Can anyone help me? How to do I remove the SATA data cable connector? There is no locking tab visible at all, and the connector doesn’t release. I ordered a replacement part, which clearly has a metal locking tab, but the original one on the board does not. Do I just pull hard? I tried to pry it open with a small metal screwdriver, but it does not seem to open up. Thanks so much for any help!

Sounds like you got the wrong cable. Does yours look like this one? 27” iMac 27 Late 2013 SATA Drive Cable. If not post a picture or two so we can see what you have and what you are struggling with Adding images to an existing question