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7. Unthread the 24–pin power cable from the chassis clip.

8. Remove the screws that secure the power supply to the back of the computer.

9. Push in on the blue release tab beside the power supply, and slide the power

towards the front of the computer.

Main Page

Notes, Cautions, and Warnings2
- Table of Contents3
1 Working on Your Computer9
- Before Working Inside Your Computer9
- Recommended Tools10
- Turning off Your Computer10
- After Working Inside Your Computer11
2 Cover13
- Removing the Cover13
- Installing the Cover13
3 Front Bezel15
- Removing the Front Bezel15
- Installing the Front Bezel16
4 Cards17
- Removing the Expansion Card17
- Installing the Expansion Card19
5 Optical Drive21
- Removing the Optical Drive21
- Installing the Optical Drive22
6 Hard Drive23
- Removing the Hard Drive23
- Installing the Hard Drive25
7 Memory27
- Removing the Memory27
- Installing the Memory28
8 Chassis Intrusion Switch29
- Removing the Chassis Intrusion Switch29
- Installing the Chassis Intrusion Switch30
9 Speaker31
- Removing the Speaker31
- Installing the Speaker32
10 Heat Sink33
- Removing the Heat Sink and Processor33
- Installing the Heat Sink and Processor35
11 Coin-Cell Battery37
- Removing the Coin-Cell Battery37
- Installing the Coin-Cell Battery38
12 Power-Switch Cable39
- Removing the Power-Switch Cable39
- Installing the Power-Switch Cable40
13 Front Thermal Sensor41
- Removing the Front Thermal Sensor41
- Installing the Front Thermal Sensor42
14 Chassis Fan43
- Removing the System Fan43
- Installing the System Fan44
15 Input/Output Panel47
- Removing the Input/Output Panel47
- Installing the Input/Output Panel48
16 Power Supply49
- Removing the Power Supply49
- Installing the Power Supply51
17 System Board53
- Removing the System Board53
- Installing the System Board54
18 Power Supply Unit (PSU) Thermal Sensor57
- Removing the PSU Thermal Sensor57
- Installing the PSU Thermal Sensor58
19 System Setup59
- Boot Menu59
- Boot Menu Enhancements59
- Timing Key Sequences60
- Beep Codes and Text Error Messages61
- Navigation61
- System Setup Options61
20 Troubleshooting73
- Diagnostic Leds73
  - Diagnostic Light Patterns73
- Beep Codes80
- Error Messages83
  - Address Mark Not Found83
  - Alert! Previous Attempts at Booting this System Have Failed at Checkpoint [Nnnn]. for Help in Resolving this Problem, Please Note this Checkpoint and Contact Dell Technical Support83
  - Alert! Security Override Jumper Is Installed84
  - Attachment Failed to Respond84
  - Bad Command or File Name84
  - Bad Error-Correction Code (ECC) on Disk Read84
- Controller Has Failed84
- Data Error84
- Decreasing Available Memory85
- Diskette Drive 0 Seek Failure85
- Diskette Read Failure85
- Diskette Subsystem Reset Failed85
- Gate A20 Failure85
- General Failure85
- Hard-Disk Drive Configuration Error85
- Hard-Disk Drive Controller Failure86
- Hard-Disk Drive Failure86
- Hard-Disk Drive Read Failure86
- Invalid Configuration Information-Please Run SETUP Program86
- Invalid Memory Configuration, Please Populate DIMM186
- Keyboard Failure86
- Memory Address Line Failure at Address, Read Value Expecting Value86
- Memory Allocation Error87
- Memory Data Line Failure at Address, Read Value Expecting Value87
- Memory Double Word Logic Failure at Address, Read Value Expecting Value87
- Memory Odd/Even Logic Failure at Address, Read Value Expecting Value87
- Memory Write/Read Failure at Address, Read Value Expecting Value87
- Memory Size in CMOS Invalid87
- Memory Tests Terminated by Keystroke88
- No Boot Device Available88
- No Boot Sector on Hard-Disk Drive88
- No Timer Tick Interrupt88
- Non-System Disk or Disk Error88
- Not a Boot Diskette88
- Plug and Play Configuration Error88
- Read Fault89
- Requested Sector Not Found89
- Reset Failed89
- Sector Not Found89
- Seek Error89
  - Shutdown Failure89
  - Time-Of-Day Clock Stopped89
  - Time-Of-Day Not Set-Please Run the System Setup Program90
  - Timer Chip Counter 2 Failed90
  - Unexpected Interrupt in Protected Mode90
  - Your Hard Drive by Calling Your Support Desk or Dell90
  - Specifications. It Is Advisable to Immediately Back up Your Data and Replace Your Hard Drive by Calling Your Support Desk or Dell90
  - Write Fault90
  - Write Fault on Selected Drive91
  - Is Not Accessible. the Device Is Not Ready91
21 Specifications93
- Technical Specifications93
22 Contacting Dell103

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