Dell Dimension 2200 - Manual (Page 60)

60 Adding Parts
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Removing the Computer Cover
CAUTION: Before you begin any of the procedures in this section,
follow the safety instructions on page 9.
CAUTION: To guard against electrical shock, always unplug your
computer from the electrical outlet before opening the cover.
1 Shut down the computer (see page 20).
2 Turn off any attached devices and disconnect them from their
electrical outlets.
NOTICE: To disconnect a network cable, first unplug the cable from your
computer and then unplug it from the network wall jack.
3 Disconnect the computer power cable from the wall outlet, and then
press the power button to ground the system board.