iMac late 2012, 21.5"

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I needed to boost the memory from 8GB to 16GB for Final Cut, get rid of the SSHD in favor of a 500GB Samsung SSD.

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It went well! iFixit's super great guides did help me a lot!

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You can just lift the power supply, you don't need to fully remove it. Keep all screws in order because there are a hole bunch of different ones. Be gentle when removing the connectors on the logic board because they are easily ripped.