Dell Dimension 2100 System Reference Manual page 59

6. Press the power-supply retaining clips and lift the power supply and fan
assembly out of the computer.
Control Panel
To remove the control panel:
1.
Remove the front cover
2. Disconnect the control panel from the system board.
3. Press the mounting tabs to release the control panel and remove the
control panel assembly.
Cards
.
1 Control panel
assembly
2 Mounting tabs