Dell Dimension 2300 - Manual (Page 72)

72 Adding Parts
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CAUTION: Some network adapters automatically start the
computer when they are connected to a network. To guard against
electrical shock, be sure to unplug your computer from its
electrical outlet before installing any cards.
6 Align the cutout on the bottom of the card with the crossbar in the
system board connector. Gently rock the card into the connector until
it is fully seated.
Ensure that the card is fully seated and that its bracket is within the
card slot.
card cutout
card
card connector
on system board
crossbar