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As I’m looking to buy some iMac that may just need fixing. is there a site dating tell me straight away if the screen will be bonded or on magnets

Very simple! Older Intel iMac’s from 2011 back use magnets to hold the cover glass iMac Intel 27" EMC 2429 Display Replacement From 2012 and newer the full display assembly is glued to the case iMac Intel 27" EMC 2546 Display Replacement Both require different tools and techniques to open so as not to damage things. Take the time to review these two guides.