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Working on Your Computer
Dell™ OptiPlex™ 780 Ultra Small Form Factor—Service Manual
Before Working Inside Your Computer
Recommended Tools
Turning Off Your Computer
After Working Inside Your Computer
Before Working Inside Your Computer
Use the following safety guidelines to help protect your computer from potential damage and to help to ensure your
personal safety. Unless otherwise noted, each procedure included in this document assumes that the following conditions
exist:
You have performed the steps in Working on Your Computer.
You have read the safety information that shipped with your computer.
A component can be replaced or—if purchased separately—installed by performing the removal procedure in
reverse order.
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.
CAUTION: Only a certified service technician should perform repairs on your computer. Damage due to
servicing that is not authorized by Dell is not covered by your warranty.
CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by
periodically touching an unpainted metal surface, such as a connector on the back of the computer.
CAUTION: Handle components and cards with care. Do not touch the components or contacts on a card.
Hold a card by its edges or by its metal mounting bracket. Hold a component such as a processor by its
edges, not by its pins.
CAUTION: When you disconnect a cable, pull on its connector or on its pull-tab, not on the cable itself.
Some cables have connectors with locking tabs; if you are disconnecting this type of cable, press in on
the locking tabs before you disconnect the cable. As you pull connectors apart, keep them evenly
aligned to avoid bending any connector pins. Also, before you connect a cable, ensure that both
connectors are correctly oriented and aligned.
NOTE: The color of your computer and certain components may appear differently than shown in this document.
To avoid damaging your computer, perform the following steps before you begin working inside the computer.
1. Ensure that your work surface is flat and clean to prevent the cover from being scratched.
2. Turn off your computer (see Turning Off Your Computer
).
CAUTION: To disconnect a network cable, first unplug the cable from your computer and then unplug
the cable from the network device.
3. Disconnect all network cables from the computer.
4. Disconnect your computer and all attached devices from their electrical outlets.
5. Press and hold the power button while the computer is unplugged to ground the system board.
6. Remove the cover (see Removing the cover
).
CAUTION: Before touching anything inside your computer, ground yourself by touching an unpainted
metal surface, such as the metal at the back of the computer. While you work, periodically touch an
unpainted metal surface to dissipate static electricity, which could harm internal components.
Recommended Tools
The procedures in this document may require the following tools: