Release button Power supply Screws AC power connector | Dell 755

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1	release button	2	power supply
3	screws (4)	4	AC power connector

6Slide the power supply toward the front of the computer by approximately 1 inch.

7Lift the power supply up and out of the computer.

8Slide the replacement power supply into place.

9Replace the screws that secure the power supply to the back of the computer chassis.

10Reconnect the DC power cables to the power supply.

11Connect the AC power cable to the AC power connector.

12Replace the computer cover (see "Replacing the Computer Cover" on page 317).

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Power Supply

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Dell 755 manual Release button Power supply Screws AC power connector

Contents

Dell OptiPlex User’s Guide W . d e l l . c o m s u p p o r t . d e l l . c o m September JN460 Contents DC Power Connectors P3, P5, P8, and P9 General Drive Installation GuidelinesConnecting and Disconnecting Drive Cables Desktop Computer General Drive Installation Guidelines 127 Connecting and Disconnecting Drive Cables 129DC Power Connector P5 and P6 160 Contents 127 Small Form Factor Computer Specifications 175 163About Your Small Form Factor Computer 165 166 Connecting and Disconnecting Drive Cables 196 197199 202 Ultra Small Form Factor Computer Specifications 241 Connecting and Disconnecting Drive Cables 248About Your Ultra Small Form Factor Computer 227 228 Installing a Device When Your Computer Is Turned Off 255 About Smart Cards and Fingerprint Readers 276 Contents255 258 Deleting or Changing an Existing System Password 278 Deleting or Changing an Existing Administrator Password 280277 278 Configuring Power Management Settings 295 294295 296 Addressing Memory Configurations 314 313316 Mini-Tower, Desktop, and Small Form Factor Computers 317 Problems writing to an optical drive 333 Mail, Modem, and Internet Problems 334Troubleshooting Power Problems 339 329 Using Microsoft Windows System Restore 359 Undoing the Last System Restore 360Using Dell PC Restore and Dell Factory Image Restore 361 Windows Vista Dell Factory Image Restore 362 Returning Items for Warranty Repair or Credit 367 365366 367 How to set up my computer Finding InformationDesktop System Software DSS Support.dell.com What Are You Looking For? Find It Here Warranty information Dell Product Information Guide Order status, warranty, and repair information UpdatesSegment, and enter your Service Tag For your configuration How to use Windows XP Not ship with your computer System you ordered Before You Begin Recommended ToolsBefore Working Inside Your Computer Turning Off Your Computer Before You Begin Mini Tower Computer About Your Mini Tower ComputerFront View Mini Tower Computer Blinking green The computer is in a power-saving mode Power problem may exist see Power Problems on21 for more information No light The computer is turned off Back View Green a good connection exists between a 10-Mbps network Back Panel ConnectorsAddress. For more information, see System Setup Options on That came with your computer Removing the Computer CoverCap Security cable slot Cover release latch Padlock ring Chassis Intrusion Switch Inside Your Computer Removing the Chassis Intrusion Switch Replacing the Chassis Intrusion Switch Resetting the Chassis Intrusion Detector System Board Components SATA3 Mini Tower Computer Mini Tower Computer Specifications Connectors Connector sizeConnector data width Maximum PCI Express Connectors Drives Two Sata Serial ATA hard drivesOne3.5-inch floppy drive or media reader Two Sata optical drives AC power source Wattage Controls and LightsHeat dissipation Rating Voltage Weight Physical HeightWidth Depth Mini Tower Specifications Cards Installing a PCI or PCI Express CardCards Cards Cards Cards Removing a PCI or PCI Express Card Card-edge connector Card connector Card retention latch Alignment guide PS/2 Serial Port Adapter Card retention latch Card fully seated Card not fully seated Bracket within slot Cards Card retention latch Alignment guide Installing eSATA Cards General Drive Installation Guidelines Drives Power Cable Connectors Sata Connector Hard Drive Data cable Hard drive system board Power cable Connector Hard drive Release tabs Snap the bracket onto the new drive Drives Drives Hard drive Hard drive bracket Pins Drives Floppy Drive Floppy drive Drive release latch Floppy drive Shoulder screws Shoulder screw slots Media Card Reader Media card reader Drive release latch Media card Shoulder screws Shoulder screw slots Reader Optical Drive Optical drive Drive release latch Optical drive Shoulder screws Shoulder screw slots Power cable Data cable Sata optical drive connector Processor ProcessorRemoving the Processor Installing the Processor Processor Processor Panel PanelRemoving the I/O Panel Replacing the I/O Panel Power Supply Power SupplyReplacing the Power Supply Release button Power supply Screws AC power connector DC Power Connectors DC Power Connector P1 Pin Number Signal name AWG Wire Pin Number Signal Name DC Power Connector P2DC Power Connectors P3, P5, P8, and P9 DC Power Connector P7 DC Power Connector P10 Speakers Installing a SpeakerSpeakers Removing a Speaker Desktop Computer About Your Desktop ComputerYour Computer on page 21 for more information Desktop Computer Blinking or solid amber See Power Problems on Power Management for Windows XP and Windows Vista on Position Removing the Computer Cover Inside Your Computer Chassis Intrusion Switch Replacing the Chassis Intrusion Switch Removing the Heat Sink Assembly System Board Components Desktop Computer Desktop Computer Specifications Desktop Computer Specifications PCI without riser-card cage Connectors Maximum PCI Express without riser-card Cage ConnectorsBoard Card or a DVI graphics card for dual-monitor support Maximum Expansion Bus Connector sizeMaximum ESATA Desktop Computer Specifications 100 One3.5-inch floppy drive or media card readerOne Sata optical drive Port adapter Power source Wattage 101 Rating Power Heat dissipation102 Expansion Cards PCI Cards103 Expansion Cards 105 Expansion Cards 107 Expansion Cards 109 Expansion Cards 111 112 113 Press in on the tab to raise the card-retention latch 114 115 PS/2 Serial Port Adapter 117 Expansion Cards 119 Riser-card cage Handle Riser cards 121 Expansion Cards ESATA 123 Expansion Cards 125 Replace the riser 127 128 Drive Inserts 129 130 131 Drive release latch Optical drive 133 134 135 Drive insert 137 Information Guide Drives Drive release latch Media card reader 139 Drive insert 141 Hard Drive 143 Hard drive Release tabs Plastic hard drive bracket 145 Drives 147 Data cable Hard drive system board Connector 149 Installing the Processor 151 Processor 153 Replacing the I/O Panel 155 Release button Power supply Screws AC power connector 157 Pin Signal name 18-AWG Number Wire 158 159 DC Power Connector P3 DC Power Connector P4DC Power Connector P5 and P6 160 161 162 163 164 Small Form Factor Computer About Your Small Form Factor Computer165 Small Form Factor Computer 166 167 Removing the Computer Cover 169 170 171 172 173 174 175 Small Form Factor Computer SpecificationsSmall Form Factor Computer Specifications 176 ConnectorMaximum PCI Express Connector 177 Port adapter Video 178 179 180 181 Expansion Cards 183 184 PCI Express and DVI Cards 185 186 187 Expansion Cards 189 Expansion Cards 191 PS2/SERIAL2 193 Expansion Cards General Installation Guidelines 195 Serial ATA Sata Connector 197 Securing tabs Hard drive 199 Release tabs Hard drive Hard drive bracket 201 Replacing a Hard Drive Fan 203 Optical Drive 205 Floppy Drive 207 Installing a Floppy Drive 209 Media card reader data cable Replacing a Media Card Reader 211 Drives 213 Installing the Processor 215 Processor 217 Replacing the I/O Panel 219 Mounting screw Pin Signal Name Number 221 222 223 DC Power Connectors P3Pin Signal 18-AWG Number Name Wire 224 DC Power Connector P5DC Power Connector P6 225 226 Ultra Small Form Factor Computer About Your Ultra Small Form Factor Computer227 3 4 Blinking or solid yellow See Power Problems on Side View228 Management for Windows XP and Windows Vista on 229 Network controller is turned off in system setup Connecting Two Monitors 231 232 233 Removing the Chassis Intrusion Switch 235 236 Cable Cover Optional 237 Connecting the AC Power Adapter Information Guide Dell Badge 239 240 Ultra Small Form Factor Computer Specifications 241 Ultra Small Form Factor Computer Specifications 242 243 Physical AC power source244 245 246 Your computer supports One Sata serial ATA hard drive 247 248 249 Drives 251 Drives 253 Drives Installing a Device When Your Computer Is Turned Off Module Bay255 Module Bay Bottom of computer Security screw 257 Latch release Securing a Device in the Module Bay 259 260 261 Top of heat sink Heat sink Retention base Release tab 263 Processor 265 266 267 Removing a Speaker Advanced Features Advanced FeaturesLegacySelect Technology Control Manageability Error Message Description Active Management Technology270 Advanced Functionality 271 Alert Description Alert Standard FormatDell OpenManage Applications Dell Client Manager DCM 273 Option Settings Physical SecurityChassis Intrusion Detection Padlock Ring and Security Cable Slot 275 Enabling the TPM FeatureTrusted Platform Module TPM Security Management Software Computer Tracking SoftwareAbout Smart Cards and Fingerprint Readers 276 277 Password ProtectionSystem Password Type the password and press Enter Administrator Password 279 System Setup Disabling a Forgotten Password and Setting a New PasswordEntering System Setup Overview 281 System Setup ScreensSystem Setup Options Internal default 282 No Boot setting 283 284 Performance 285 Computrace server Event Log 286Suspend Boot Sequence 287 Booting to a USB Device Memory Key 289 Jumper SettingsMini Tower and Desktop Small Form Factor Advanced Features Clearing Forgotten Passwords Ultra Small Form Factor Computer Jumper Setting Description Clearing Cmos Settings 291 Options in Windows XP Power Management for Windows XP and Windows VistaHyperthreading and Multi-Core Technology 293 Options in Windows Vista About RAID Configurations 295 Segment Hard drive Verifying That RAID Is WorkingRAID Level 297 RAID Level 1 ConfigurationConfiguring Your Computer for RAID Creating a RAID Level 0 Configuration Creating a RAID Level 1 Configuration 299 Creating a RAID Level 1 Configuration 301 Migrating to a RAID Level 0 ConfigurationMigrating to a RAID Level 1 Configuration Advanced Features Battery Replacing the BatteryBattery 303 Battery 305 306 Replacing the System Board Replacing the System Board307 Mini Tower System Board Screws 308 Desktop System Board Screws 309 Small Form Factor System Board Screws 310 Ultra Small Form Factor System Board Screws 311 312 313 MemoryDDR2 Memory Overview Addressing Memory Configurations Installing Memory Memory connector closest to Securing clips Processor 315Cutouts Memory module Crossbar Removing Memory Replacing the Computer Cover Mini-Tower, Desktop, and Small Form Factor ComputersUltra Small Form Factor Computers 317 318 319 Installing Your Computer in an EnclosureInstalling Your Computer in an Enclosure 320 321 Installing Your Computer in an Enclosure Cleaning Your Computer Cleaning a Non-Optical MouseCleaning an Optical Mouse Computer, Keyboard, and Monitor Floppy Drive CDs and DVDs Microsoft Windows Features Microsoft Windows XP FeaturesTransferring Information to a New Computer Microsoft Windows XP Microsoft Windows XP Features 327 Microsoft Windows VistaClick Finished and restart the new computer Setting Up a Home and Office Network Connecting to a Network AdapterNetwork Setup Network device Network adapter connector on computer 329 330 Troubleshooting Battery ProblemsCard Problems Solving Problems Drive Problems 332 Optical drive problems Problems writing to an optical driveHard drive problems 333 Mail, Modem, and Internet Problems 334Click Properties→ Tools→ Check Now Windows XP Click Start→ All Programs→ Modem Helper 335 Keyboard Problems Lockups and Software Problems Other software problems Program crashes repeatedlyProgram is designed for an earlier Windows operating system Solid blue screen appears 338 Memory ProblemsMouse Problems Network Problems Power ProblemsTroubleshooting Power Problems 339 Power Supply Self-Test 340 Printer Problems 341 Scanner Problems Sound and Speaker ProblemsNo sound from speakers 342 Video and Monitor Problems No sound from headphonesScreen is blank Screen is difficult to read 343 Power Lights 3D image quality is poor 345 Power Light Problem Description Suggested ResolutionSystem Lights Power Light Problem Description 346 347 Diagnostic LightsLight Pattern Problem Description Light Pattern Problem Description Suggested Resolution 348 349 Code Cause Beep Codes350 Message Possible Cause Corrective Action System Messages351 352 Message Possible Cause Dell Diagnostics When to Use the Dell Diagnostics353 Product Information Guide Solving Problems Tab Function 355Option Function Identifying Drivers What Is a Driver?Drivers Reinstalling Drivers and Utilities 357 358 Using Microsoft Windows System Restore You can restore your operating system in the following waysRestoring Your Operating System To start the Hardware Troubleshooter Starting System Restore 361 Using Dell PC Restore and Dell Factory Image RestoreUsing PC Restore Removing PC Restore Image Restore Using the Operating System Media Click Finish to reboot the computerClick Exit if the Install Windows message appears 363 Solving Problems Online Services Getting HelpObtaining Assistance 365 Support Service AutoTech ServiceAutomated Order-Status Service 367 Problems With Your OrderBefore You Call 368 Guide 369 Contacting Dell 371 WarrantyWarranty 372 FCC Notices U.S. Only FCC Class B373 FCC Notices US Only 374 Glossary 375 376 377 378 379 380 381 382 383 Video resolution See resolution 384 385 386