Dell OptiPlex GXi Reference And Installation Manual page 70

Each of these switches has two positions, or settings
(usually on and off). To change the setting of a slide
switch, use a small, pointed object such as a small screw-
driver or a straightened paper clip to slide the switch to
the proper position. To change the setting of a rocker
switch, use the screwdriver or paper clip to press down
on the appropriate side of the switch. In either case, do
Dell OptiPlex GX i Midsize Systems Reference and Installation Guide
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