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Edit by irvbromberg

Edit declined by Sam Goldheart

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[* red] Remove the eight T10 Torx screws securing the LCD to the outer case.
+[* black] During reassembly, after reinstalling these screws you can reinstall the RAM and test if the iMac works alright before reinstalling the glass panel. If the installed second drive is a non-Apple SSD and you are using OS X El Capitan or later then you can enable TRIM support by executing this Terminal command: sudo trimforce enable