Dell OptiPlex 990 Desktop - Write Fault on Selected Drive; Is Not Accessible. the Device Is Not Ready

Dell OptiPlex 990 Desktop

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Write fault on selected drive

Description The operating system cannot write to the floppy or hard drive.

X:\ is not accessible. The device is not ready

Description The floppy drive cannot read the disk. Insert a floppy disk into the drive

and try again.

91

Table of Contents

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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