DELL NT499 ユーザーズマニュアル

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Adding and Replacing Parts
the drive.
13 Verify that your computer works correctly by running the Dell Diagnostics 
Removing an Optical Drive (Desktop Computer)
Remove the front panel (see "Removing the Front Panel" on page 154).
4 Disconnect the power cable from the back of the drive and the CD/DVD 
drive cable from the back of the drive and the system board.
1
power cable
2
CD/DVD-drive cable
3
SATA connector
2
1
3