Dell OptiPlex 5260 All-in-One - Chassis; Front chassis view

8 Install the back cover:
a Place the back cover on the system.
b Press and hold the tab [1], and align the notches on the back cover with the slots on the middle frame.
c Slide the back cover in the direction shown to lock the back cover tab under the latch on the system-board shield [2].
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Intel Optane