Dell Dimension 2100 System Reference Manual page 50

1.
Rotate the power supply
2. Check all cable connections, especially those that might have come
loose during your work. Fold cables and unused connectors out of the
way so that they do not catch on the computer cover or interfere with
airflow inside the computer.
3. Check to see that no tools or extra parts (including screws) are left
inside the computer.
4. Place the computer upright with the front facing you. Align the computer
cover so its bottom hooks fit in the computer s curved hinge.
5. Lift up the cover, making sure to keep the bottom hooks aligned with the
curves in the computer.
6. Gently squeeze the right and left sides of the computer together until the
cover clicks into position.
Rotating the Power Supply
1.
Remove the computer cover
back into place.
.
1 Release latch
2 Power supply
3 Drive power cables