Dell OptiPlex 980 (Early 2010) - Manual (Page 61)

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Power Supply
Dell™ OptiPlex™ 980 Service Manual—Desktop
WARNING: Before working inside your computer, read the safety information that shipped with your
computer. For additional safety best practices information, see the Regulatory Compliance Homepage at
www.dell.com/regulatory_compliance.
Removing the Power Supply
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the optical drive .
3. Remove the hard drive and heat sink and processor .
4. Disconnect the main power connector from the system board.