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Replacing the System Board
Dell™OptiPlex™745User'sGuide
Removing the System Board: Mini Tower, Desktop, Small Form Factor, and Ultra-Small Form
Factor Computers
1. Follow the procedures in Before You Begin.
2. Remove any components that restrict access to the system board (optical drive(s), floppy drive, hard drive, I/O panel (as applicable).
3. Remove the processor and heat sink assembly:
l mini tower: see Processor
l desktop: see Processor
l small form-factor: see Processor
l ultra-small form factor: see Processor
4. Disconnect all cables from the system board.
5. Remove the screws from the system board.
l mini tower: Mini Tower System Board Screws
l desktop: Desktop System Board Screws
l small form-factor: Small Form Factor System Board Screws
l ultra-small form factor: Ultra Small Form Factor System Board Screws
6. Slide the system board assembly toward the front of the computer, and then lift the board up and away.
Mini Tower System Board Screws
Desktop System Board Screws
NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the
computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.
1
mini tower system board
2
screws (10)
- Mini Tower Computer 1
- Desktop Computer 1
- Small Form Factor Computer 1
- Advanced Features 2
- Physical Security 3
- Enabling the TPM Feature 4
- Computer Tracking Software 5
- Password Protection 5
- Administrator Password 6
- System Setup 7
- System Setup Screens 8
- System Setup Options 8
- Boot Sequence 11
- Booting to a USB Device 12
- Jumper Settings 12
- Clearing CMOS Settings 14
- Power Management 15
- Battery 16
- Before You Begin 18
- Cleaning Your Computer 20
- CDs and DVDs 21
- Desktop Computer 22
- Desktop Computer 26
- Expansion Cards 27
- Removing a PCI Card 30
- DC Power Connector P3 53
- DC Power Connector P4 53
- DC Power Connector P5 and P6 53
- FCC Notices (U.S. Only) 60
- Finding Information 61
- Operating System CD 62
- Getting Help 64
- Problems With Your Order 65
- Product Information 65
- Before You Call 66
- Contacting Dell 66
- Glossary 75
- Memory 83
- Removing Memory 84
- Installing Memory 85
- Mini Tower Computer 87
- Adding a Second Hard Drive 100
- Drive-Panel Inserts 101
- Optical Drive 104
- Installing an Optical Drive 105
- I/O Panel 107
- Power Supply 108
- DC Power Connectors 109
- DC Power Connector P2 110
- DC Power Connector P7 110
- DC Power Connector P10 110
- Adding User Accounts 118
- Fast User Switching 118
- Network Setup Wizard 119
- Expansion Cards 121
- Removing an Expansion Card 123
- Processor 124
- Installing the Processor 125
- Drives 128
- Hard Drive 129
- Installing a Hard Drive 130
- Replacing the I/O Panel 138
- DC Power Connectors P3 141
- DC Power Connector P5 141
- Notes, Notices, and Cautions 146
- Small Form Factor Computer 146
- Front View 147
- Back View 148
- Back-Panel Connectors 148
- Inside Your Computer 149
- System Board Components 150
- Drivers 151
- Creating a Restore Point 152
- Before You Begin 153
- Reinstalling Windows XP 154
- Solving Problems 156
- Drive Problems 157
- Keyboard Problems 158
- Fan Problems 159
- Media Card Reader Problems 160
- Memory Problems 161
- Mouse Problems 161
- Network Problems 162
- Power Problems 162
- Printer Problems 163
- Restoring Default Settings 163
- Sound and Speaker Problems 164
- Video and Monitor Problems 165
- Chassis Intrusion Switch 167
- Factor Computers 170
- Mini Tower Computer 174
- Dell Diagnostics 179
- System Lights 180
- Diagnostic Lights 181
- Beep Codes 182
- Error Messages 183
- Microsoft 186
- Windows 186
- Side View 188
- Cable Cover (Optional) 190
- Removing the Cable Cover 191
- Badge 192
- Module Bay 194
- Replacing a Hard-Drive Fan 205
- Warranty 212
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