Question about Dell (S423) for Dimension 8100 (3F546) Motherboard

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Dell Dimension 8100 Power On Reset Problem

Started with a Dell 8100 that would init. video on power up. Found that after being powered up after at least 30 min. or so that I could unplug the AC cord and replug quickly and get POST, BIOS setup, and boot to a known good Windows HD. Thought it could be power supply as its voltages were down below 5v somewhat so replaced with new DELL PS. System still exhibits the same problem. Looking for a hardware reset jumper and cant find one. Cant find pinouts on front panel ribbon cable connector. Used old PS, cut the power good sig. and then connected well after power up to see if that would force a power up. No change in problem. When I tricked it on with the power cord it ran several days and appeared stable. Removed video NVideo card, cleaned contacts and reseated. Reseated all RAM. Yellow and Green LED on MB come up when power is applied. Now getting more difficult to reset, even with re-plugging ac cord. Cant find schematics or pinouts for connectors. Thanks to all.

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Re: Dell Dimension 8100 Power On Reset Problem

Hi, Considering that this motherboard/model is a couple of years, it may be possible that: 1. Components have changed value seriously affecting performance. Predominant are capacitors near the CPU that have blisters, swollen or lost part of or completely its storage capacity. Next in line would be resistors and regulators specially those close to the memory slots. 2. If you have any USB device connected, try removing them while booting; 3. BIOS may be outdated/corrupt, flash the BIOS to the latest firmware if and when you were able to boot it up using the fdd (pls be informed of the inherent possible failure when flashing). On your other concerns: a. "...reset jumper..." - temporarily short the RTCRST pins near the battery. You may also try moving the PSWD from its default position (enabled) to disabled; b. "...pinouts on front panel ribbon cable connector..." sorry even the Dell site that I have access does not have info. It might be a bit difficult getting a replacement motherboard being a socket 423. Another item to be taken into consideration is that your motherboard still uses PC800 RDRAM 184-pin RIMM Memory. To sum, if you will replace the motherboard, chances are you will also have to replace the processor and memory. Hope this be of some help/idea. Pls post back how things turned up or should you need further information. Good luck and kind regards.

Posted on Sep 21, 2007

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1. check the CMOS battery and replace it
If it shows 3.5 or lower then it is in need of replacement and you board should work
if not a new mother board is needed.
2. check your power supply unit it may need replacement as well.
I hope this helps. Have a great day!

Oct 05, 2010 | Dell (S423) for Dimension 8100 (3F546)...

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I have a dell dimension 8100. I am wondering if the motherboard is bad or the video card. All monitors that I hook the computer up to are very dark and the blue hue seems to be very pronounced.

If this system has a video card its probably bad.
You may want to try a differnet monitor cable before spending alot of money.
If this motherboard has onboard video,take out the vid card and try the onboard video.

Aug 30, 2010 | Dell Dimension 8100 Motherboard (5E692)

1 Answer

Control panel connector pinout for Dell Dimension 1100

Well the official Dell manual can be found on their website here. I don't know if this helps or not, but I hope it does! :)

Feb 17, 2010 | Dell Motherboards

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No power. No lights. Dimension 8100. No response to the power button.

One of two things.
A) The Power Supply
B) the Motherboard.

The power supply is easy to troubleshoot. For little to nothing you should be able to take the power supply into a computer repair place and ask them to hook it up to a tester. It's real quick and simple. All they do is plug your 20 or 24 pin power cable that attaches to the motherboard to a box. It checks the power outputs of the power supply to let you know if any of the voltages are not present or way out of wack.

Jan 08, 2010 | Dell (S423) for Dimension 8100 (3F546)...

2 Answers

Can't turn my compuer on

Check on *********** board that your CMOS jumper is in normal mode otherwise change it - also check any beep sound aswell as you remove all the cables ie.. IDE cables, front panel cables I mean only the 2 power cables to the motherboard and try to start the pc by shorting the power switch pin with a screwdriver see the display coming or not ????

IF it is a branded pc - you have to buy the same companies motherboard, normal motherboard will not work with branded pcs.

Sep 27, 2008 | Dell (S423) for Dimension 8100 (3F546)...

1 Answer

Problem with the mother board.


A replacement motherboard for a Dell Inspiron 516 may be found at:
Pls confirm part number, availability, other related details and shipping cost.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Sep 27, 2008 | Dell (S423) for Dimension 8100 (3F546)...

1 Answer

Fan not found

Yes the fan was spinning. I found a soulution though. The right connecter did not fit the motherboard so someone rigged it to run but the motherboard did not see it because it was hooked straight to the atx power supply. I just broke the plastic off of where the original fan was plugged in and with the pins still intact I pushed the replacement fan connector down on it and the motherboard found the fan. Sweet Success!!!!

Sep 22, 2008 | Dell (S423) for Dimension 8100 (3F546)...

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basically your system board has a PCI controller interfave and will only allow you a maximum of 100G hard drive. if you want to upgrade to SATA interface you need to purchase a SATA Adapter card that goes to one of the vacant PCI slot. this will then allow you to upgrade to 200G-300G hard drive. you also need to upgrade your power supply. SATA hard drives has different power connectors. if you are having problems finding these parts try to ask dell spare parts at 800-3573355 or 800-8228965.

hope this resolves your problem.


Jan 03, 2008 | Dell (S423) for Dimension 8100 (3F546)...

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Dimension 8100 Power on reset

go back to where you did this ... "after leaving the power on for some time (>30 min.) I tried un plugging the AC cord and immediately plugged it in and got POST and BIOS setup and a good bood to a known good hard drive. Left it on for 3 days running AutoCAD, ran reliably."... do that again, but this time, leave the pc on and turn it off using the hibernate feature (must enable it first) as a test of potential faults.

Sep 20, 2007 | Dell (S423) for Dimension 8100 (3F546)...

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