Dell Dimension DMC Owner's Manual page 72

Pull the two front-panel tabs towards you, and then push out the front-panel insert.
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Ensure that the jumper setting on the new drive is set for "cable select" (see the
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documentation that came with the drive for information).
Remove two extra alignment screws, shown in the illustration on page 72, from the front of
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the computer and insert them into the drive.
NOTE:
Some computers come with only two extra alignment screws; others come with four. You only
need two alignment screws for this procedure.
Gently slide the drive into place.
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72
Adding Parts
tabs (2)
drive
alignment screws (2)
insert