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How to remove an atx motherboard
Begin by shutting down your computer and removing all cables from the case.
Make sure you are in a static-free environment, with rubber-soled shoes on.
It is good practice to have an anti-static wrist-wrap attached and clipped on to something metal.
It is also frequently suggested to touch things metal, other than your computer, while working with sensitive computer parts. Remove all screws holding the outer shell of your desktop or tower and slide off the metal casing.