Dell Precision T3400 (Late 2007) - Manual (Page 226)

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Adding and Replacing Parts
13 Enter System Setup (see "Entering System Setup" on page 81) and select
the appropriate Diskette Drive option (for a floppy drive) or a USB option
(for a Media Card Reader).
14 Verify that your computer works correctly by running the Dell Diagnostics
(see "Dell Diagnostics" on page 107).
Removing a Floppy Drive or a Media Card Reader (Desktop Computer)
1 Follow the procedures in "Before You Begin" on page 143.
2 Remove the computer cover (see "Removing the Computer Cover" on
page 145).
3 Remove the front panel (see "Removing the Front Panel" on page 154).
4 Disconnect the power and data cables from the back of the floppy drive or
Media Card Reader.
5 Disconnect the other end of the floppy-drive cable from the system board
connector labeled "FLOPPY" (for a floppy drive) or "USB1" (for a Media
Card Reader). To locate system board connectors, see "System Board
Components" on page 148.