Dell Dimension 2100 System Reference Manual page 48

telecommunication lines from the computer.
4. Disconnect the power cable to your computer, and then press
the power button
After you remove or replace parts in the computer, observe the following
notice to prevent damage to the computer:
NOTICE: Make sure that all other computer cables are connected before
connecting the computer to its electrical outlet.
Recommended Tools
Small flat-blade screwdriver
•
Wide flat-blade screwdriver
•
#1 and #2 Phillips-head screwdrivers
•
1/4-inch nut driver
•
Tweezers or long-nose pliers
•
Wrist grounding strap
•
Cover
to ground the system board.