Dell C521 Before You Begin, Getting Started, Recommended Tools, Turning Off Your Computer

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Before You Begin

Dell™ Dimension™ C521 Service Manual

Getting Started

Recommended Tools

Turning Off Your Computer

Before Working Inside Your Computer

Getting Started

This manual provides procedures for removing and replacing the components in your computer. Unless otherwise noted, each procedure assumes that the following conditions exist:

You have performed the steps in Turning Off Your Computer and Before Working Inside Your Computer.

You have read the safety information in your Dell™ Product Information Guide.

A component can be replaced by performing the removal procedure in reverse order. Directional instructions are also performed on the reverse.

Recommended Tools

The procedures in this document may require the following tools:

Small flat-blade screwdriver

Phillips #0, #1, and #2 screwdrivers

Flash BIOS update program (download from support.dell.com)

Turning Off Your Computer

NOTICE: To avoid losing data, save and close any open files and exit any open programs before you turn off your computer.

1.Shut down the operating system:

a.Save and close any open files, exit any open programs, click the Start button, and then click Shut Down.

b.In the Shut Down Windows window, select Shut Down.

The computer turns off after the operating system shutdown process finishes.

2.Ensure that the computer and any attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut down your operating system, press and hold the power button for 4 seconds.

Before Working 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: 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.

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: When you disconnect a cable, pull on its connector or on its strain-relief loop, not on the cable itself. Some cables have a connector 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.

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

1.Follow the steps in Turning Off Your Computer.

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Contents September 2006 Rev. A00 Front View About Your ComputerBack View of the Computer Back Panel I/O ConnectorsBack to Contents Getting Started Before You BeginRecommended Tools Turning Off Your ComputerPage Replacing the Computer Cover Removing the Computer Cover DDR2 Memory Overview Removing and Installing PartsMemory Installing Memory Removing Memory CardsInstalling an Expansion Card Removing an Expansion Card Drives Drive Interface Connectors General Installation GuidelinesPower Cable Connector Connecting and Disconnecting Drive CablesRemoving a CD/DVD Drive Installing a CD/DVD DriveCD/DVD Drive Removing a Floppy Drive Floppy DriveInstalling a Floppy Drive Removing a Media Card Reader Media Card ReaderInstalling a Media Card Reader Removing a Hard Drive Hard DriveInstalling a Hard Drive Replacing the Battery BatteryRemoving the Processor ProcessorInstalling the Processor Page Replacing the Power Supply Power SupplyRemoving the Front I/O Panel Front I/O PanelRemoving the Fan Assembly Fan AssemblyInstalling the Front I/O Panel Removing the System Board Installing the Fan AssemblySystem Board Replacing the System Board Page Specifications Controls and Lights ConnectorsDrives Environmental PowerPhysical Entering System Setup System SetupOverview OverviewSystem System Setup Options64MB Post Behavior Boot MenuJumper Locations Clearing Password Settings Clearing Forgotten Passwords and Cmos SettingsClearing Cmos Settings Flashing the BiosSystem Board Components Technical OverviewInside View of Your Computer Jumper Setting Description Jumper SettingsPin Number Signal name AWG Wire Power Supply DC Connector Pin AssignmentsDC Power Connector P1 DC Power Connector P3 DC Power Connector P2DC Power Connector P4 DC Power Connector P5 and P6Black +12 VDC Yellow September 2006 Rev. A00 Dell Diagnostics TroubleshootingWhen to Use the Dell Diagnostics Dell Diagnostics Main MenuPower Light Problem Description Suggested Resolution Diagnostic LightsProblem Description Suggested Resolution System LightsCode Cause Beep Codes