Dell OptiPlex 7440 All-In-One W11C Owner'S Manual Download

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Working on your computer

Before working inside your computer

To avoid damaging your computer, perform the following steps before you begin working inside the computer.

2. Ensure that your work surface is flat and clean to prevent the computer cover from being scratched.
3. Ensure you follow the

Turning off your computer

4. Disconnect all network cables from the computer.

CAUTION:

To disconnect a network cable, first unplug the cable from your computer and then unplug the cable from

the network device.

5. Disconnect your computer and all attached devices from their electrical outlets.
6. Press and hold the power button while the computer is unplugged to ground the system board.

NOTE:

To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching

an unpainted metal surface at the same time as touching a connector on the back of the computer.

Recommended tools

The procedures in this document require the following tools:

•

Small flat blade screwdriver

•

Phillips # 1 screwdriver

•

Small plastic scribe

Safety instructions

Use the following safety guidelines to protect your computer from potential damage and to ensure your personal safety. Unless otherwise
noted, each procedure included in this document assumes that the following conditions exist:

•

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.

NOTE:

Disconnect all power sources before opening the computer cover or panels. After you finish working inside the

computer, replace all covers, panels, and screws before connecting to the power source.

NOTE:

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:

Many repairs may only be done by a certified service technician. You should only perform troubleshooting and

simple repairs as authorized in your product documentation, or as directed by the online or telephone service and
support team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. Read and follow
the safety instructions that came with the product.

CAUTION:

To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching

an unpainted metal surface at the same time as touching 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

Working on your computer