Dell 720H2C appendix Before You Begin, Recommended Tools, Preparing to Work Inside Your Computer

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Removing and Installing Parts

Dell™ XPS™ 720 Owner's Manual

Before You Begin	Liquid Cooling Assembly
Removing the Computer Cover	Processor
Memory	Fans
Cards	System Board
Drives	Power Supply
Hard Drive	Front I/O Panel
Drive Panel	Battery
Floppy Drive	Removing the Computer Stand
Media Card Reader	Replacing the Computer Cover
Optical Drive

Before You Begin

This chapter provides procedures for removing and installing the components in your computer. Unless otherwise noted, each procedure assumes that a component can be replaced by performing the removal procedure in reverse order.

Recommended Tools

The procedures in this document may require one or more of the following tools:

•Small flat-blade screwdriver

•Phillips screwdriver

•Flash BIOS update (see the Dell support website at support.dell.com)

Preparing to Work Inside Your Computer

Use the following safety guidelines to help protect your computer from potential damage and to help ensure your own personal safety.

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

CAUTION: To reduce the risk of fire, electric shock, or injury, do not overload an electrical outlet, power strip, or convenience receptacle. The total ampere rating of all products plugged into an electrical outlet, power strip, or other receptacle should not exceed 80 percent of the branch circuit rating.

CAUTION: Your computer is heavy and can be difficult to maneuver. Seek assistance before attempting to lift, move, or tilt the computer and always lift correctly to avoid injury; avoid bending over while lifting.

CAUTION: The liquid cooling assembly is not user serviceable or upgradeable. All required service should be done by qualified service personnel only. The liquid cooling assembly in your system contains a non-refillable coolant. In the event of a coolant leak, shut down your system immediately. Unplug your system from the power outlet and contact Dell Technical Support. In the event of skin contact with the coolant, wash your skin with soap and water. Seek medical attention if irritation develops. In the event of eye contact with the coolant, rinse your eyes immediately with water, with your eyelids open, for 15 minutes. Seek medical attention if irritation persists.

NOTICE: 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.

NOTICE: To avoid electrostatic discharge and damage to internal components, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface on the computer chassis.

NOTICE: Handle components and cards with care. Do not touch the components or contacts on a card. Instead, hold a card by its edges or by its metal mounting bracket. Hold a component such as a microprocessor by its edges, not by its pins.

NOTICE: When disconnecting a cable, pull on the cable's connector or its strain-relief loop, not on the cable itself. Some cables have connectors with locking tabs; before disconnecting this type of cable, press inward on the locking tabs to release the connector. When connecting or disconnecting a cable, ensure that the connectors are correctly oriented and aligned to avoid damage to the connector and/or the connector's pins.

1. Ensure that the work surface is level and protected to prevent either the surface or the computer from being scratched.

NOTICE: To avoid losing data, save any work in progress and exit all open programs before turning off your computer.

2. Shut down the operating system:

• In Windows XP, click Start→ Turn Off Computer→ Turn off.