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Diagnostic Lights
To help you troubleshoot a problem, your computer has four lights labeled "1," "2," "3," and "4"on the front or back panel. The lights can be off or green.
When the computer starts normally, the patterns or codes on the lights change as the boot process completes. When the computer starts normally, the
patterns or codes on the lights change as the boot process completes. If the POST portion of system boot completes successfully, all four lights display solid
green. If the computer malfunctions during the POST process, the pattern displayed on the LEDs may help identify where in the process the computer halted.
then turns off
(see Diagnostic Lights).
Solid yellow
The Dell Diagnostics is running a test, or a device
on the system board may be faulty or incorrectly
installed.
If the Dell Diagnostics is running, allow the testing to complete.
If the computer does not boot, contact Dell for technical assistance
(see Contacting Dell).
Blinking yellow
A power supply or system board failure has
occurred.
See Power Problems.
Solid green and a beep code
during POST
A problem was detected while the BIOS was
executing.
See Beep Codes for instructions on diagnosing the beep code. Also,
check the diagnostic lights to see if the specific problem is identified
(see Diagnostic Lights).
Solid green power light and no
beep code and no video during
POST
The monitor or the graphics card may be faulty or
incorrectly installed.
Check the diagnostic lights to see if the specific problem is identified
(see Diagnostic Lights). See Video and Monitor Problems.
Solid green power light and no
beep code but the computer
locks up during POST
An integrated system board device may be faulty.
Check the diagnostic lights to see if the specific problem is identified
(see Diagnostic Lights). If the problem is not identified, contact Dell
for technical assistance (see Contacting Dell).
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
NOTE: The orientation of the diagnostic lights may vary depending on the system type. The diagnostic lights can appear either vertical or horizontal.
Light Pattern
Problem Description
Suggested Resolution
The computer is in a normal "off"
condition, or a possible pre-BIOS failure
has occurred.
The diagnostic lights are not lit after the
computer successfully boots to the
operating system.
Plug the computer into a working electrical outlet and press the power button.
A possible BIOS failure has occurred; the
computer is in the recovery mode.
Run the BIOS Recovery utility, wait for recovery completion, and then restart the computer.
A possible processor failure has occurred.
Reinstall the processor and restart the computer.
Memory modules are detected, but a
memory failure has occurred.
l If you have one memory module installed, reinstall it and restart the computer. (see
Memory for instructions on how to remove and install memory modules.)
l If you have two or more memory modules installed, remove the modules, reinstall one
module, and then restart the computer. If the computer starts normally, reinstall an
additional module. Continue until you have identified a faulty module or reinstalled all
modules without error.
l If available, install properly working memory of the same type into your computer.
l If the problem persists, contact Dell (see Contacting Dell).
A possible graphics card failure has
occurred.
l If the computer has a graphics card, remove the card, reinstall it, and then restart the
computer.
l If the problem still exists, install a graphics card that you know works and restart the
computer.
l If the problem persists or the computer has integrated graphics, contact Dell (see
Contacting Dell).
A possible floppy or hard drive failure has
occurred.
Reseat all power and data cables and restart the computer.
A possible USB failure has occurred.
Reinstall all USB devices, check cable connections, and then restart the computer.
No memory modules are detected.
l If you have one memory module installed, reinstall it and restart the computer. See
Memory for instructions on how to remove and install memory modules.
l If you have two or more memory modules installed, remove the modules, reinstall one
module, and then restart the computer. If the computer starts normally, reinstall an
additional module. Continue until you have identified a faulty module or reinstalled all
modules without error.
l If available, install properly working memory of the same type into your computer.
l If the problem persists, contact Dell (see Contacting Dell).
- Mini Tower Computer 1
- Desktop Computer 1
- Advanced Features 2
- Password Protection 3
- Administrator Password 4
- System Setup 5
- System Setup Options 6
- Boot Sequence 8
- Booting to a USB Device 9
- Floppy Drive 10
- Clearing CMOS Settings 11
- Hyper-Threading 11
- Power Management 11
- Battery 13
- Before You Begin 15
- Cleaning Your Computer 17
- Back to Contents Page 18
- Desktop Computer 21
- Back View 22
- Back-Panel Connectors 22
- Inside Your Computer 23
- System Board Components 24
- PCI and PCI Express Cards 25
- Removing an Expansion Card 26
- Processor 28
- Installing the Processor 29
- Drives 31
- CD/DVD Drive 32
- Installing a CD/DVD Drive 33
- Floppy Drive 34
- Installing a Floppy Drive 35
- Hard Drive 36
- Installing a Hard Drive 37
- DC Power Connector P3 42
- DC Power Connector P5, P6 42
- FCC Notice (U.S. Only) 48
- Finding Information 49
- Operating System CD 50
- Getting Help 52
- Problems With Your Order 53
- Product Information 53
- Before You Call 54
- Contacting Dell 54
- Glossary 64
- Memory 72
- Removing Memory 73
- Installing Memory 73
- Mini Tower Computer 76
- PCI and PCI Express Cards 81
- Connecting Drive Cables 89
- Data Cable Connectors 89
- IDE Drive Addressing 90
- Power Cable Connectors 90
- Adding a Second Hard Drive 93
- Drive-Panel Inserts 95
- Installing the Floppy Drive 97
- Removing a CD/DVD Drive 99
- I/O Panel 101
- Power Supply 102
- DC Power Connectors 103
- DC Power Connector P2 104
- DC Power Connector P4 104
- DC Power Connector P7 104
- Adding User Accounts 111
- Fast User Switching 111
- Network Setup Wizard 111
- Abbreviations and Acronyms 114
- Desktop Computer 114
- Drivers 115
- Creating a Restore Point 116
- Before You Begin 117
- Reinstalling Windows XP 118
- Solving Problems 120
- Keyboard Problems 121
- Memory Problems 123
- Mouse Problems 123
- Network Problems 124
- Power Problems 124
- Printer Problems 125
- Restoring Default Settings 125
- Sound and Speaker Problems 126
- Video and Monitor Problems 127
- System Board 129
- Dell Diagnostics 132
- System Lights 133
- Diagnostic Lights 134
- Beep Codes 135
- Error Messages 136
- Microsoft 139
- Windows 139
- Warranty 140
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