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Dell 755 manual Removing the Heat Sink Assembly

Models: 755

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3Select the Chassis Intrusion option and then press the left- or right-arrow key to select Reset. Change the setting to On, On-Silent, or Disabled.

NOTE: The default setting is On-Silent.

4Save your BIOS settings and exit system setup.

Removing the Heat Sink Assembly

1Loosen the captive screw on each side of the heat sink assembly.

CAUTION: Despite having a plastic shield, the heat sink assembly may be very hot during normal operation. Be sure that it has had sufficient time to cool before you touch it.

2Rotate the heat sink assembly upward, and remove the assembly from the computer. Lay the heat sink down on its top.

1

2

1heat sink assembly

2captive screw housing (2)

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Desktop Computer

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Dell 755 manual Removing the Heat Sink Assembly

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 mSeptember JN460 Contents Connecting and Disconnecting Drive Cables General Drive Installation GuidelinesDC Power Connectors P3, P5, P8, and P9 Desktop Computer DC Power Connector P5 and P6 160 Contents General Drive Installation Guidelines 127Connecting and Disconnecting Drive Cables 129 127About Your Small Form Factor Computer 165 Small Form Factor Computer Specifications 175163 166199 Connecting and Disconnecting Drive Cables 196197 202About Your Ultra Small Form Factor Computer 227 Ultra Small Form Factor Computer Specifications 241Connecting and Disconnecting Drive Cables 248 228255 Installing a Device When Your Computer Is Turned Off 255About Smart Cards and Fingerprint Readers 276 Contents 258277 Deleting or Changing an Existing System Password 278Deleting or Changing an Existing Administrator Password 280 278295 Configuring Power Management Settings 295294 296316 Addressing Memory Configurations 314313 Mini-Tower, Desktop, and Small Form Factor Computers 317Troubleshooting Power Problems 339 Problems writing to an optical drive 333Mail, Modem, and Internet Problems 334 329Using Dell PC Restore and Dell Factory Image Restore 361 Using Microsoft Windows System Restore 359Undoing the Last System Restore 360 Windows Vista Dell Factory Image Restore 362366 Returning Items for Warranty Repair or Credit 367365 367Desktop System Software DSS How to set up my computerFinding Information Support.dell.comWhat Are You Looking For? Find It Here Warranty information Dell Product Information GuideSegment, and enter your Service Tag Order status, warranty, and repair informationUpdates For your configuration How to use Windows XPNot ship with your computer System you orderedBefore Working Inside Your Computer Before You BeginRecommended Tools Turning Off Your ComputerBefore You Begin Front View Mini Tower ComputerAbout Your Mini Tower Computer Mini Tower Computer21 for more information Blinking green The computer is in a power-saving modePower problem may exist see Power Problems on No light The computer is turned offBack View Address. For more information, see System Setup Options on Back Panel ConnectorsGreen a good connection exists between a 10-Mbps network Cap Removing the Computer CoverThat came with your computer Security cable slot Cover release latch Padlock ring Chassis Intrusion Switch Inside Your ComputerRemoving the Chassis Intrusion Switch Replacing the Chassis Intrusion SwitchResetting the Chassis Intrusion Detector System Board Components SATA3 Mini Tower Computer Mini Tower Computer Specifications Connector data width ConnectorsConnector size Maximum PCI Express ConnectorsOne3.5-inch floppy drive or media reader DrivesTwo Sata Serial ATA hard drives Two Sata optical drivesHeat dissipation AC power source WattageControls and Lights Rating VoltageWidth WeightPhysical Height DepthMini 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 guidePS/2 Serial Port Adapter Card retention latchCard fully seated Card not fully seated Bracket within slot Cards Card retention latch Alignment guide Installing eSATA Cards General Drive Installation Guidelines DrivesPower Cable Connectors Sata ConnectorHard 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 Removing the Processor ProcessorProcessor Installing the Processor Processor Processor Removing the I/O Panel PanelPanel Replacing the I/O Panel Replacing the Power Supply Power SupplyPower Supply Release button Power supply Screws AC power connector DC Power Connectors DC Power Connector P1Pin Number Signal name AWG Wire DC Power Connectors P3, P5, P8, and P9 DC Power Connector P2Pin Number Signal Name DC Power Connector P7 DC Power Connector P10Speakers Installing a SpeakerSpeakers Removing a Speaker Your Computer on page 21 for more information Desktop ComputerAbout Your Desktop Computer Desktop ComputerBlinking or solid amber See Power Problems on Power Management for Windows XP and Windows Vista onPosition 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 SpecificationsBoard PCI without riser-card cage ConnectorsMaximum PCI Express without riser-card Cage Connectors Card or a DVI graphics card for dual-monitor supportMaximum ESATA Desktop Computer Specifications Expansion Bus Connector sizeMaximum One Sata optical drive 100One3.5-inch floppy drive or media card reader Port adapterPower source Wattage 101102 Power Heat dissipationRating 103 PCI CardsExpansion Cards 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 123Expansion Cards 125 Replace the riser 127 128 Drive Inserts 129130 131 Drive release latch Optical drive 133 134 135 Drive insert 137 Information Guide DrivesDrive 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 158159 DC Power Connector P5 and P6 DC Power Connector P3DC Power Connector P4 160161 162 163 164 165 Small Form Factor ComputerAbout Your Small Form Factor Computer Small Form Factor Computer166 167 Removing the Computer Cover 169 170 171 172 173 174 Small Form Factor Computer Specifications Small Form Factor Computer Specifications175 Maximum PCI Express Connector Connector176 177 Port adapter Video178 179 180 181 Expansion Cards 183 184 PCI Express and DVI Cards 185186 187 Expansion Cards 189 Expansion Cards 191 PS2/SERIAL2 193 Expansion Cards General Installation Guidelines 195Serial 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 211Drives 213 Installing the Processor 215 Processor 217 Replacing the I/O Panel 219 Mounting screw Pin Signal Name Number 221222 Pin Signal 18-AWG Number Name Wire DC Power Connectors P3223 DC Power Connector P6 DC Power Connector P5224 225 226 227 Ultra Small Form Factor ComputerAbout Your Ultra Small Form Factor Computer 3 4228 Blinking or solid yellow See Power Problems onSide View Management for Windows XP and Windows Vista on229 Network controller is turned off in system setup Connecting Two Monitors 231232 233 Removing the Chassis Intrusion Switch 235 236 Cable Cover Optional 237Connecting the AC Power Adapter Information GuideDell Badge 239240 Ultra Small Form Factor Computer Specifications 241Ultra Small Form Factor Computer Specifications 242243 244 AC power sourcePhysical 245 246 Your computer supports One Sata serial ATA hard drive 247248 249 Drives 251 Drives 253 Drives 255 Installing a Device When Your Computer Is Turned OffModule Bay Module BayBottom of computer Security screw 257 Latch release Securing a Device in the Module Bay 259260 261 Top of heat sink Heat sink Retention base Release tab 263 Processor 265 266 267 Removing a Speaker LegacySelect Technology Control Advanced FeaturesAdvanced Features Manageability270 Error Message DescriptionActive Management Technology Advanced Functionality271 Dell OpenManage Applications Alert Standard FormatAlert Description Dell Client Manager DCM 273Chassis Intrusion Detection Option SettingsPhysical Security Padlock Ring and Security Cable SlotTrusted Platform Module TPM Enabling the TPM Feature275 About Smart Cards and Fingerprint Readers Security Management SoftwareComputer Tracking Software 276System Password Password Protection277 Type the password and press Enter Administrator Password 279Entering System Setup System SetupDisabling a Forgotten Password and Setting a New Password OverviewSystem Setup Options System Setup Screens281 Internal default 282No Boot setting 283284 Performance285 Computrace serverSuspend 286Event Log Boot Sequence 287Booting to a USB Device Memory KeyMini Tower and Desktop Small Form Factor Advanced Features Jumper Settings289 Clearing Forgotten Passwords Ultra Small Form Factor Computer Jumper Setting DescriptionClearing Cmos Settings 291Hyperthreading and Multi-Core Technology Power Management for Windows XP and Windows VistaOptions in Windows XP 293 Options in Windows Vista About RAID Configurations 295RAID Level Verifying That RAID Is WorkingSegment Hard drive Configuring Your Computer for RAID RAID Level 1 Configuration297 Creating a RAID Level 0 Configuration Creating a RAID Level 1 Configuration299 Creating a RAID Level 1 Configuration Migrating to a RAID Level 1 Configuration Migrating to a RAID Level 0 Configuration301 Advanced Features Battery BatteryReplacing the Battery 303Battery 305 306 307 Replacing the System BoardReplacing the System Board Mini Tower System Board Screws 308Desktop System Board Screws 309Small Form Factor System Board Screws 310Ultra Small Form Factor System Board Screws 311312 DDR2 Memory Overview Memory313 Addressing Memory Configurations Installing MemoryCutouts Memory module Memory connector closest to Securing clips Processor315 CrossbarRemoving Memory Ultra Small Form Factor Computers Replacing the Computer CoverMini-Tower, Desktop, and Small Form Factor Computers 317318 Installing Your Computer in an Enclosure Installing Your Computer in an Enclosure319 320 321 Installing Your Computer in an Enclosure Cleaning an Optical Mouse Cleaning Your ComputerCleaning a Non-Optical Mouse Computer, Keyboard, and MonitorFloppy Drive CDs and DVDsTransferring Information to a New Computer Microsoft Windows FeaturesMicrosoft Windows XP Features Microsoft Windows XPMicrosoft Windows XP Features Click Finished and restart the new computer Microsoft Windows Vista327 Network Setup Setting Up a Home and Office NetworkConnecting to a Network Adapter Network device Network adapter connector on computer329 330 Card Problems TroubleshootingBattery Problems Solving ProblemsDrive Problems 332Hard drive problems Optical drive problemsProblems writing to an optical drive 333Click Properties→ Tools→ Check Now Mail, Modem, and Internet Problems334 Windows XP Click Start→ All Programs→ Modem Helper335 Keyboard Problems Lockups and Software ProblemsProgram is designed for an earlier Windows operating system Other software problemsProgram crashes repeatedly Solid blue screen appearsMouse Problems Memory Problems338 Troubleshooting Power Problems Network ProblemsPower Problems 339Power Supply Self-Test 340Printer Problems 341No sound from speakers Scanner ProblemsSound and Speaker Problems 342Screen is blank Screen is difficult to read Video and Monitor ProblemsNo sound from headphones 343Power Lights 3D image quality is poorSystem Lights Power Light Problem Description Suggested Resolution345 Power Light Problem Description 346Light Pattern Problem Description Diagnostic Lights347 Light Pattern Problem Description Suggested Resolution 348349 350 Beep CodesCode Cause 351 System MessagesMessage Possible Cause Corrective Action 352 Message Possible Cause353 Dell DiagnosticsWhen to Use the Dell Diagnostics Product Information GuideSolving Problems Option Function 355Tab Function Drivers What Is a Driver?Identifying Drivers Reinstalling Drivers and Utilities 357358 Restoring Your Operating System Using Microsoft Windows System RestoreYou can restore your operating system in the following ways To start the Hardware TroubleshooterStarting System Restore Using PC Restore Using Dell PC Restore and Dell Factory Image Restore361 Removing PC Restore Image RestoreClick Exit if the Install Windows message appears Using the Operating System MediaClick Finish to reboot the computer 363Solving Problems Obtaining Assistance Online ServicesGetting Help 365Automated Order-Status Service AutoTech ServiceSupport Service Before You Call Problems With Your Order367 368 Guide369 Contacting Dell Warranty Warranty371 372 373 FCC Notices U.S. OnlyFCC Class B FCC Notices US Only374 Glossary 375376 377 378 379 380 381 382 383 Video resolution See resolution 384385 386