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HP t540: Disassembly 

Disassembly

Disassembly is similar to the t530, t540, and t740, except that after removing the rear panel, there is no green button - instead, removing the rear panel releases the side panel and it can simply be lifted off. There is a hole where a screw can be installed next to the ethernet port to secure the side panel, but mine didn't have anything here.

The other side panel contains a center section that can be removed using a fingernail or screwdriver in the slot in its corner. Removing this panel allows access to the regulatory labels and VESA mounting points.