Introduction
Dell Optiplex 745 Small Form Factor panel removal
Tools
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Remove the side panel/cover
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Pull the slide at the top back.
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This releases the panel, and it can be removed easily.
 
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Remove the back cover.
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Unscrew the 3 screws at the back, next to the power cable slot.
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Pull along the sides of the cover bit by bit to remove each holder from its respective slot
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.