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My T3400 station won't start. Diagnostic lights are flashing (3and 4) suggesting"Memory modules are detected, but a memory failure has occurred" tried to reset memory with no success. Is it possible that there's problem with memory buses on motherboard.

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It is possible, but generally it is a RAM failure

If issue persists trying each module in slot one, then MB

Posted on Oct 06, 2010

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Posted on Jan 02, 2017

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1 Answer

Power light amber with code 3 and 4


Hi,
Looks like Memory Issue,
Memory modules are detected, but a memory power failure has occurred.
You can try as follows :
  • If two or more memory modules are installed, remove the modules, then reinstall one module and restart the computer. If the computer starts normally, continue to install additional memory modules (one at a time) until you have identified a faulty module or reinstalled all modules without error. If only one memory module is installed, try moving it to a different DIMM connector and restart the computer.
  • If available, install verified working memory of the same type into your computer.
Let me know
Thanks

Feb 18, 2014 | Dell OptiPlex 780 PC Desktop

1 Answer

My pc 520 will not boot up numbers 4 & 5 light up with blank screen and buzing noise, how do i fix this


There are only 4 diagnostic LED lights. If you mean lights 3 and 4, that indicates you have a memory problem. 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 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.

Apr 08, 2013 | Dell Dimension Computers & Internet

1 Answer

My dell optiplex gx620 does not start and it shows no. 3 and 4 lights illuminated on its front . what could be the problem.?


One of your memory chips is bad.

Maybe your memory is bad or the memory slot is bad.

Remove the Power Cord, Open the Case and remove one of the memory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x on it with an ink pen. If it fails to boot then move the chip to the next memory slot and try rebooting. If it fails take the chip out and set it aside, then put the other chip in and try booting it in both slots. If it boots, just to verify that the chip set aside is bad, mark an x on it and put it into the open memory chip slot and try booting.

Diagnostic Lights caution.gif CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located 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 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.
note.gif 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

tools011.jpg
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.

tools013.jpg
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.

tools012.jpg
A possible processor failure has occurred.
Reinstall the processor and restart the computer.

tools014.jpg
Memory modules are detected, but a memory failure has occurred.

  • 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.)
  • 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.
  • If available, install properly working memory of the same type into your computer.
  • If the problem persists, contact Dell.

tools015.jpg
A possible graphics card failure has occurred.
  • If the computer has a graphics card, remove the card, 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 or the computer has integrated graphics, contact Dell.

tools016.jpg
A possible floppy or hard drive failure has occurred.
Reseat all power and data cables and restart the computer.

tools018.jpg
A possible USB failure has occurred.
Reinstall all USB devices, check cable connections, and then restart the computer.

tools019.jpg
No memory modules are detected.
  • 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.)
  • 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.
  • If available, install properly working memory of the same type into your computer.
  • If the problem persists, contact Dell.

tools020.jpg
Memory modules are detected, but a memory configuration or compatibility error exists.

tools021.jpg
An other failure has occurred.
This pattern also displays during System Setup and may not indicate a problem.
  • Ensure that the cables are properly connected to the system board from the hard drive, CD drive, and DVD drive.
  • Check the computer message that appears on your monitor screen.
  • If the problem persists, contact Dell.

tools022.jpg
After POST is complete, all four diagnostic lights turn green briefly before turning off to indicate normal operating condition.
None.

Jun 06, 2012 | Dell OptiPlex GX620 PC Desktop

1 Answer

OPTIPLEX 960 error codes 3 and 4 at startup. Solid amber light.


"optiplex 960 error codes 3 & 4 at startup"

Found out by myself the google suggestion to look up the Dell Diagnostics page:
http://support.dell.com/support/edocs/systems/Op745/en/UG_en/trouble.htm
Lights 3 & 4 means "Memory modules are detected, but a memory failure has occurred." Bingo! I didn't actually replace memory sticks, but pulled them out and put back in one by one. Only three out of four sticks were accepted. Works.

Jun 05, 2012 | Computers & Internet

2 Answers

I have a Dell DImension PC. It suddenly shutdown during i surf the net and when i restart the PC, it doesn't boot-up and the 3 & 4 diagnostic light lit-up.


I'd have to look at a manual but i'd say you have a ram problem. I will look at he manual and if you have one you should look as well. How much ram do you have?

Mar 28, 2011 | Dell Dimension 3100 PC Desktop

2 Answers

Solid amber light. No power to the system just the fan runs.


Solid amber light means the CPU is not being powered properly, that is USUALLY a bad power supply. Contact Dell and order another power supply. if that doesnt fix it, you have a bum board. (usually, you will see popped capacitors on the board if its bad). I will say, that in about 70% of these, its a bad power supply. power supplys arent cheap (unless you have a warranty of course) but they wont break the bank. a replacement is likely going to be about 40-70 dollars. I havent priced it, but you can ask dell at dell.com/chat. Good luck.

Nov 19, 2009 | Dell DimensionTM XPS 710 PC Desktop

1 Answer

Computer on start up makes noise and the 3 & 4 and battery icon light up and nothing comes up on monitor.


Hi,
The diagnostics codes that you have got indicate
Memory modules are detected, but a memory failure has occurred.
solution:
  • 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.
  • If available, install properly working memory of the same type into your computer.
  • If the problem persists, contact Dell (see your computer Owner's Manual for information about how to contact Dell).
Owners manual to help you reseat the memory modules
http://support.dell.com/support/edocs/systems/dim5150/en/sm/parts1.htm#wp1364711


Thanks for using Fixya
proton

Nov 09, 2009 | Dell Dimension E310 PC Desktop

2 Answers

My Dell Optiplex GX520 will not boot. There is no video output and the 3 and 4 diagnostic lights remain on.


If 1 & 2 are off ... then you have problems.

Memory modules are detected, but a memory failure has occurred.
  • 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.)
  • 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.
  • If available, install properly working memory of the same type into your computer.
  • If the problem persists, contact Dell (see Contacting Dell).

According to Dell's notes:
Memory modules are detected, but a memory failure has occurred.

Their remedies are:
  • 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.)
  • 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.
  • If available, install properly working memory of the same type into your computer.
  • If the problem persists, contact Dell (see Contacting Dell).

Jun 17, 2009 | Dell OptiPlex GX520 PC Desktop

1 Answer

Memory detected/Memory failure on Dell Dimension PC


So basically the computer does not start. Because I am not sure that is what you are saying.

I think from my understanding it is an issue with vista rather than with the computer. Somehow the new driver has put your computer in sleep mode. The computer of friend of mine starts by itself.

Another I want to say that the memory cards are fragile they can go bad. The way you touch them it is important.

Feb 01, 2008 | Dell Dimension 2400 PC Desktop

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