Dell OptiPlex 380 (Late 2009) - Manual (Page 30)

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Power Supply
Dell™ OptiPlex™ 380 Service Manual— Mini-Tower
Removing the Power Supply
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the screws that secure the power supply to the back of the computer.
3. Disconnect the hard-drive power cable from the hard drive.
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.