What you need
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Lay the Dell Optiplex GX260 down on a clean flat surface with the rear towards you.
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Push the oval shaped buttons located on the top and bottom of the PC simultaneously and lift the case straight up.
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Almost done!
To close the case, simply press it closed until you hear the tabs click into place.
Conclusion
To close the case, simply press it closed until you hear the tabs click into place.