Using The Optional Stand For Vertical Orientation - Dell OptiPlex E1 Reference And Installation Manual

See "Using the Optional Stand for Vertical Orientation" in Chapter 1 for
instructions.
From the front of the computer, press in the two release buttons (located on the
sides of the cover toward the back). With the buttons depressed, lift the cover at
the back, allowing it to pivot up toward you (see Figure 5-2).
Disengage the plastic hooks that secure the cover to the front of the chassis, and
lift the cover away.
front of computer
release buttons (2)
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To replace the computer cover, follow these steps:
Working Inside Your Computer 5-3