Introduction
The optical drive (also known the CD drive) is one of the most frequently used parts of the HP Media Center 876x. As a result, damages are common and often replacement is necessary.
Tools
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            Place the tower on its side. 
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            Slide the side panel horizontally to detach, and pull upward to remove. 
 
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            Orient the tower vertically. 
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            Using the #0 Phillips head screwdriver, unscrew and remove the two (5 mm) screws that fasten the remaining side panel to the tower. 
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            Slide the side panel out of its notches, and pull it gently off of the tower. 
 
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            Gently move the tower so that it is in the horizontal orientation. 
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            Press down the black tabs (proximal to you) that fasten the front panel to the tower. 
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            Press down on the distal, black tabs (symmetric with respect to the previous tabs). 
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            Pull front panel forward slightly. 
 
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            Orient the tower vertically. 
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            The front panel will come off in a hinge-like fashion, exposing the drives underneath. 
 
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            Identify the optical drive. 
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            Pull the molex connectors out of the posterior end of the optical drive. 
 
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            Using the Phillips #0 screwdriver, remove the two 5 mm screws that fasten the optical drive into its port. 
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            Gently pull the optical drive through the front cavity. 
 
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To reassemble your device, follow these instructions in reverse order.