Question about Dell Dimension 8400 PC Desktop

3 Answers

Dell Dimension 8400

I have yellow yellow green green lights on back of computer. Solid green light on front. Won't boot and sometimes fan is very loud. Any help?

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  • chrisdha Aug 14, 2008

    Exactly the same issue. Y Y G G diagnostic lights, beeping, loud fan. I have followed dell's instructions and removed and reinstalled my 4 memory modules one after another, either all are faulty or something else is going on!



    This issue follows weeks of dealing with 0x0000007E and 7B errors! All hdd diagnostics show no sign of faults.

  • Hollyecho Montgomery
    Hollyecho Montgomery May 11, 2010

    1. Does the monitor give you any information then go blank?

    i. If it does come up what does it read?



    2. Is there any beeps that you hear when you try to start your computer?



    3. When did this start ?



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I have this exact problem.

The Dell Dimension 8400 will seem to randomly go into fan-jet-turbo mode on power-up and fail to boot. The problem I'm referring to is not a heat problem which an over-speed fan might otherwise suggest but a hardware problem the details I'll get to in a bit

I've done all the normal and obvious stuff that has been reported before

remove/replace memory
remove/replace AGP video card
removed all extra power loading / drives / USB etc
BIOS tweaks/resets
check supply voltages with a DMM (I even re-adjusted the hipot to get the right voltage - it was a little low)

As an engineer it is important to determine root cause. Do to this it is necessary to find a way to make the problem occur and not occur. If you're able to do this you can fix it.

Well in my case the problem it related to a mechanical stress on the heatsink. What I mean is a little force pushing the heat sink toward the fan turns off the problem (boots normally) while a little force in the directly away from the fan turns-on the problem (fan-jet-turbo-mode).

The root cause is could one of several things, it could be a damaged motherboard with a broken trace, it could be a socketing issue,

The Fix (not really - just a band-aide) was to use a tie a couple of small tie-wraps through a some small holes in the heatsink then through the fan mounting holes.

Only slight pressure is necessary - too much will likely cause permanent damage. The fan is mounted on rubber isolators so it somewhat limits the force on the heatsink

Any this mechanical issue is somewhat supported but all the information I've read - how removing/replacing the CPU can fix the problem, changing memory, removing cards - all these mechanicall stress the motherboard and likely move the heatsink some.

Intermittent problems are the worst to debug!

Ross
San Jose, Ca

Dell Dimension 8400 - fe54be0.jpg


Posted on Dec 07, 2008

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Ross in San Jose - YOU ROCK - Dell CS Lady wold me to get a new computer (I LOVE mine - not a single problem, 4 yrs old)-

DO WHAT ROSS SAYS

Posted on Aug 14, 2009

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See my solution regarding bad usb ports.
sometime if there is a short in the usd it will make your computer act strange.
Just shut down and unplug the usb module and reboot

Posted on Oct 05, 2008

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1 Answer

Aux power led light is amber on dimension E521


I think your problem is your memory or video card.

Below are some steps that I recommend.

When you plug in the power cord is there any lights whatsoever on the computer?

When you press the power button do you hear fans running, hard drive spinning, lights on the computer, hear any beeps or lights constantly blinking, hear the DvD/CD drive click and the light on the drawer of the DvD/CD turn on for a second or two? If so the laptop is trying to boot or may have booted, but the screen is not showing for some reason.

Beep tones and blinking lights tells the technicians what is going on with the computer and why it is not booting. Most times it's a motherboard issue when you hear beeps or blinking lights continuous. Most times the problem is with the memory or Video Card. Count the Blinking Lights or Beeps and take note of their pattern (1 Long or 1 Long followed by 2 Short).

Maybe your power cord is bad if you don't get anything to happen whatsoever when you press the power button.

Maybe you have a Static Charge Buildup. Remove the Power Cord, then Press and Hold the power button for 30 seconds. After 30 seconds plug the power cord back in and hit the power button to see if it boots.

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.

Maybe your power supply is bad. Sometimes there is enough power to make the power light or some other lights come on but not enough power to make the fan turn on or hard drive spin.


Below are links and info I found from Dell's Website based on your model.


http://support.dell.com/support/edocs/systems/dime521/en/SM_EN/specs.htm

Controls and Lights Front of computer:

Power button - push button

Power light
green light - Blinking green in sleep state; solid green for power-on state.
amber light - Blinking amber indicates a problem with the power supply inside the computer. If the system cannot boot and there is a solid amber light, this indicates a problem with the system board (see "Power Problems" in your Owner's Manual).

Diagnostic lights
four lights on the front panel (see Diagnostic Lights.)

Standby power light
AUX_PWR_LED on the system board

Hard-drive activity light
green light - When the computer is reading data from or writing data to the hard drive.

LAN indicator light

green light - Solid green indicates that a LAN (local area network) connection is established.


http://support.dell.com/support/edocs/systems/dime521/en/SM_EN/adtshoot.htm#wp1056411

Jun 03, 2012 | Dell Dimension E521 (D10E16) PC Desktop

1 Answer

DELL 8400 MAKES A LOUD FAN NOISE AND WONT BOOT


There are 2 basic fans in Dell tower one for the power supply and the other for the Processor. If your computer is not booting then the Processor fan is most likely to be the culprit. What could be happening is that the Processor fan is no longer turning fast enough to cool the processor, so normal the processor when it over heats there is either protection to switch off the computer automatically or the computer won't boot. The best thing is to change the fan and make sure it is working properly but checking on the cables that they won't entangle on top of the fan to impede it's movement. You can easily damage your processor if the fan is not working properly.

Oct 18, 2011 | Dell Dimension 8400 PC Desktop

1 Answer

Dimension 3100 wont turns no power button light there is also an green light on motherboard cpu and power suplly fans working but wont bot up


Contact technical assistance.They will most likely ask you to send it back to repair.

This chart is where I got my conclusion.

Power Light

Problem Description

Suggested Resolution
Solid green
Power is on, and the computer is operating normally. On the desktop computer, a solid green light indicates a network connection.
No corrective action is required.
Blinking green
The computer is in the suspended state (Microsoft® Windows® 2000 and Windows XP).
Press the power button, move the mouse, or press a key on the keyboard to wake the computer.
Blinks green several times and then turns off
A configuration error exists.
Check the diagnostic lights to see if the specific problem is identified.
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.
Check the diagnostic lights to see if the specific problem is identified.
If the computer does not boot, contact Dell for technical assistance.
Blinking yellow
A power supply or system board failure has occurred.
Check the diagnostic lights to see if the specific problem is identified.
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.
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 "Video and Monitor Problems" in your Owner's Manual.
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. If the problem is not identified, contact Dell for technical assistance.

Mar 06, 2011 | Dell Dimension 3100 PC Desktop

1 Answer

ABC diagnostic lights are green and D is yellow. Ram only works if slot 1 is used. If slot 1 and 3 are used Bios appears on the monitor with a flashing cursor. Dell dimension 8400


A,B,C green and D yellow is indicative of a component failure...in that the system cannot read a device it feels necessary to boot the machine such as a hard drive, floppy or cd/dvd drive. Power down the system, remove the power cord from the back, push the power button in for 10 seconds to bleed off the power. Remove and reseat all cables connecting the system devices. Remove all ram except for one stick and reboot. If you get boot, then try replacing the ram one stick at a time. If you still cannot boot though, try removing the cables from the devices and then plug in one a time until you get the machine to boot. If there is still a problem, the hard drive or its controller maybe the culprit.

Jun 14, 2010 | Dell Dimension 8400 PC Desktop

1 Answer

My dell dimension 8400 canot boot up at all and the Diagnostic Lights not light oso..so wat i can do?


The POWER and DIAG LEDs can give you information. If no DIAG LED look at the POWER LED
http://www.fixya.com/support/r4282412-find_no_post_diagnostic_information_dell
Flashing amber, most likely the power supply
Solid Amber, motherboard or item plugged into the motherboard (Expansion card, external connection etc.)

Apr 17, 2010 | Dell Dimension 8400 PC Desktop

1 Answer

Screen will not come on hard drive light no light checked power supply is ok


Things to check:
  1. Power led on the front of the tower, it should be solid green when on. Flashing Amber is generally an indication of a bad power supply inside the tower
  2. Power LED Solid AMBER indicates system is not finishing the power on self test (POST) and you remove all connections from the tower except power and try turning on again. If no change, remove all PCI and PCI-E cards from system, try again, no change replace motherboard.
  3. On the back of the tower are 4 diagnostic LEDs near the ps2 ports marked ABCD, after the POST, during a normal boot the will flash in several sequences and with boot is finished all 4 should be green. If they stop an a different pattern, then that indicates a failure Yellow Yellow Green Green indicate bad RAM for example
  4. If the LEDs on front and back are Green then the system appears to be booting but the monitor display is not functional

Feb 05, 2010 | Dell Dimension 4600 PC Desktop

1 Answer

Dell Dimension 8400 Won't Boot Up


call dell first tell them the problem,they should help you,or use chat i use that sometimes.

Apr 18, 2009 | Dell Dimension 8400 PC Desktop

1 Answer

SOLID AMBER LIGHT ON DIMENSION 3000


One of two things:

Either the power supply is marginal

or

the motherboard is bad.

Good luck.

Mar 09, 2009 | Dell Dimension 8400 PC Desktop

2 Answers

Dell Dimension 8400, no post. B and D amber.


GYGY diagnostic lights -- Memory is detected, but a memory configuration or compatibility error exists, and the 1-3-2 beep sound indicates the MEMORY test failed, which means one of the four memory has gone bad or the one of the four slots on the motherboard has gone bad, Neither the memory nor the mother board has completely gone bad, but either one slot or one memory has gone bad, try placing one memory on all slots and check which slot is the issue, then trying placing any 3 memory on the remainig slot to isolate the memory, then after that use the best 3 in the best 3 slots and check, you computer should work fine, this would help you for sure

Feb 06, 2009 | Dell Dimension 8400 PC Desktop

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