It may be that your keyboard needs replacement, or it could a Keyboard Controller/motherboard failure. If your Keyboard and Mouse stop functioning, then it is probably the latter.
Check your performance monitor.Start>in search type,
perfmon>click program>click "continue">click "
reliability Monitor">check for issues.
Diagnostic Lights
CAUTION:
Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
To help you troubleshoot a problem, your computer has four lights labeled "1," "2," "3," and "4" on the front panel (see "
Front View of the Computer"). When the computer starts normally, the lights flash. After the computer starts, all four lights display solid green. If the computer malfunctions, the color and sequence of the lights identify the problem.
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 system successfully boots to the operating system.
Plug the computer into a working electrical outlet. Also see "
Power Lights."
A possible processor failure has occurred.
Reinstall the
processor and restart the computer.
Memory modules are detected, but a memory failure has occurred.
- If you have two or more memory modules installed, remove the modules, reinstall one module (see "Memory"), 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.
- If available, install properly working memory of the same type into your computer (see "Memory").
- If the problem persists, contact Dell.
A possible graphics card failure has occurred.
- If the computer has a graphics card, remove the card (see "Cards"), reinstall it, and then restart the computer.
- If the problem still exists, install a graphics card that you know works and restart the computer.
- If the problem persists, contact Dell.
A possible floppy drive 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.
- If you have two or more memory modules installed, remove the modules, reinstall one module (see "Memory"), 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.
- If available, install properly working memory of the same type into your computer (see "Memory").
- If the problem persists, contact Dell.
Memory modules are detected, but a memory configuration or compatibility error exists.
- Ensure that no special memory module/memory connector placement requirements exist (see "Memory").
- Verify that the memory modules that you are installing are compatible with your computer (see "Memory").
- If the problem persists, contact Dell.
A possible expansion card failure has occurred.
- <LI value=1>Determine if a conflict exists by removing a card (not a graphics card) and restarting the computer (see "Cards"). <LI value=2>If the problem persists, reinstall the card that you removed, remove a different card, and then restart the computer. <LI value=3>Repeat this process for each card. If the computer starts normally, troubleshoot the last card removed from the computer for resource conflicts (see "Cards").
- If the problem persists, contact Dell.
Another failure has occurred.
- Ensure that the cables are properly connected to the system board from the hard drive, CD drive, and DVD drive (see "System Board Components").
- If there is an error message on your screen identifying a problem with a device (such as the floppy drive or hard drive), check the device to make sure it is functioning properly.
- The operating system is attempting to boot from a device (such as the floppy drive or hard drive); check system setup to make sure the boot sequence is correct for the devices installed on your computer.
- If the problem persists, contact Dell.
The computer is in a normal operating condition after POST.
None.
Beep Codes
Your computer might emit a series of beeps during start-up if the monitor cannot display errors or problems. This series of beeps, called a beep code, identifies a problem. One possible beep code (code 1-3-1) consists of one beep, a burst of three beeps, and then one beep. This beep code tells you that the computer encountered a memory problem.
Reseating the memory modules may fix the beep code errors in the following table.
Code Cause
1-3-1 through 2-4-4
Memory not being properly identified or used
4-3-1
Memory failure above address 0FFFFh
Code Cause
1-1-2
Microprocessor register failure
1-1-3
NVRAM
1-1-4
ROM BIOS checksum failure
1-2-1
Programmable interval timer
1-2-2
DMA initialization failure
1-2-3
DMA page register read/write failure
3-1-1
Slave DMA register failure
3-1-2
Master DMA register failure
3-1-3
Master interrupt mask register failure
3-1-4
Slave interrupt mask register failure
3-2-2
Interrupt vector loading failure
3-2-4
Keyboard Controller Test failure
3-3-1
NVRAM power loss
3-3-2
NVRAM configuration
3-3-4
Video Memory Test failure
3-4-1
Screen initialization failure
3-4-2
Screen retrace failure
3-4-3
Search for video ROM failure
4-2-1
No time tick
4-2-2
Shutdown failure
4-2-3
Gate A20 failure
4-2-4
Unexpected interrupt in protected mode
4-3-3
Timer-chip counter 2 failure
4-3-4
Time-of-day clock stopped
4-4-1
Serial or parallel port test failure
4-4-4
Cache test failure
Message
Possible Cause
Corrective Action
8042 Gate-A20 error
The keyboard controller failed its test.
If you receive this message after you make changes in the system setup program,
enter the system setup program and restore the original value(s).
Address Line Short!
An error in the address decoding circuitry in the memory has occurred.
Reseat the
memory modules.
C: Drive Error
C: Drive Failure
The hard drive is not working or is not configured correctly.
Ensure that the drive is installed correctly in the computer and defined correctly in the
system setup program.
Cache Memory Bad, Do Not Enable Cache
The cache memory is not operating.
See "Contacting Dell" in your
Owner's Manual for instructions on obtaining technical assistance.
CH-2 Timer Error
An error is occurring on the timer on the system board.
See "Contacting Dell" in your
Owner's Manual for instructions on obtaining technical assistance.
CMOS Battery State Low
CMOS Checksum Failure
CMOS System Options Not Set
CMOS Display Type Mismatch
CMOS Memory Size Mismatch
CMOS Time and Date Not Set
The system configuration information in the system setup program is incorrect or the battery charge may be low.
Enter the system setup program, verify the system configuration, and then restart the computer.
Diskette Boot Failure
Drive A or B is present but has failed the BIOS POST.
Ensure that the drive is installed correctly in the computer and defined correctly in the
system setup program. Check the interface cable at both ends.
DMA Error
DMA 1 Error
DMA 2 Error
Error in the DMA controller on the system board.
The keyboard or
system board may need to be replaced.
FDD Controller Failure
HDD Controller Failure
The BIOS cannot communicate with the floppy drive or hard drive controller.
Ensure that the floppy drive or the
hard drive is installed correctly in the computer and defined correctly in the
system setup program. Check the interface cable at both ends.
INTR1 Error
INTR2 Error
An interrupt channel on the system board failed to POST.
The keyboard or
system board may need to be replaced.
Invalid Boot Diskette
The operating system cannot be located on drive A or drive C.
Enter the system setup program and confirm that drive A or drive C is properly identified.
Keyboard Error
The BIOS has detected a stuck key.
Ensure that nothing is resting on the keyboard; if a key appears to be stuck, carefully pry it up. If the problem persists, you may need to replace the keyboard.
KB/Interface Error
An error occurred with the keyboard connector.
Ensure that nothing is resting on the keyboard; if a key appears to be stuck, carefully pry it up. If the problem persists, you may need to replace the keyboard.
No ROM Basic
The operating system cannot be located on drive A or drive C.
Enter the system setup program and confirm that drive A or drive C is properly identified.
Source:
Documentation
