Dell Dimension 2300 - Manual (Page 15)

3. Disconnect any telephone or telecommunication lines from the computer.
4. Disconnect your computer and all attached devices from their electrical outlets, and then press the power button to ground the system board.
5. Remove the computer cover .
6. Release and remove the front panel:
a. Push the release lever to release both the top tab and the middle tab.
b. Reach inside the computer and push the bottom tab towards you to release it.
c. Rotate the front panel to separate it from the side hinges.
To reattach the front panel, attach the side hinges and then rotate the front panel until it snaps onto the front of the computer.
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network wall jack.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the
computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.