Dell Precision 330 - Manual (Page 54)

54 Installing Upgrades
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Computer Cover
Removing the Computer Cover
CAUTION: Before you perform this procedure, see " Safety First—
For You and Your Computer ."
1 Turn off the computer and peripherals, and disconnect them from
their electrical outlets.
2 If installed, remove the padlock from the padlock ring on the back
panel.
3 Remove the computer cover.
If your computer is a mini tower chassis, perform the following steps:
a Face the back of the computer and slide the outer padlock ring to
the left to unlock the cover release mechanism (see the following
figure).