Dell Precision 490 Desktop User Manual

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.
If your computer beeps during start-up:

1. Write down the beep code on the Diagnostics Checklist.

2. Run the Dell Diagnostics (see Dell Diagnostics) to identify a more serious cause.
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3. Contact Dell for technical assistance (see Contacting Dell).
l If the problem persists, contact Dell (see Contacting Dell).
Routine system activity preceding video
initialization.
Watch your monitor for on-screen messages.
A possible expansion card failure has
occurred.
1. Determine if a conflict exists by removing a card (not a graphics card) and restarting the
computer (see Cards).
2. If the problem persists, reinstall the card that you removed, remove a different card,
and then restart the computer.
3. Repeat this process for each card. If the computer starts normally, troubleshoot the last
card removed from the computer for resource conflicts (see Software and Hardware
Incompatibilities).
4. If the problem persists, contact Dell (see Contacting Dell).
Routine system activity preceding video
initialization.
Watch your monitor for on-screen messages.
The computer is in a normal operating
condition after POST.

NOTE: The diagnostic lights flicker briefly;
they are turned off after the computer
successfully boots to the operating
system.
None.
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Code

Cause
1-1-2
Microprocessor register failure
1-1-3
NVRAM read/write failure
1-1-4
ROM BIOS checksum failure
1-2-1
Programmable interval timer failure
1-2-2
DMA initialization failure
1-2-3
DMA page register read/write failure
1-3
Video Memory Test failure
1-3-1 through 2-4-4
Memory not being properly identified or used
1-3-2
Memory problem
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
Invalid 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 timer tick

Dell Precision 490 Desktop Specifications

General

Brand	Dell
Model	Precision 490 Desktop
Category	Desktop
Language	English