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Get a flathead screw driver and pop out the center in the back. It is removable and requires a tiny bit of force so don't be surprised.
Sorry, there was a problem. Please try again later.There is a quick release to slide the back plate down in order to swap it with a VESA mounting plate. This is the manual https://kaas.hpcloud.hp.com/pdf-public/pdf_7374913_en-US-1.pdf which has the instructions for removing the plate and how to use a VESA mount.
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