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

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Dimension 8100 Power on reset

I have a Dimension 8100 that exhibits a power on reset type problem. I replaced PS with Dell branded new power supply. Before and after it trys to power on as soon as AC is applied to the PS. However video never initialized. By chance, 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. Power button did work to power off, and Win shut down worked properly. However same problem when trying to cold boot. Used old power supply (which did the same thing) and cut the power good and manually connected to delay the PG sig. but does nothing when connected. Cant find a hardware reset connector on the motherboard (Cant immagine why they wouldnt have one, even if only used in manufacturing.) Cant find pinout for front panel connector ribbon cable to see if one is hidden in there somewhere. Appreciate any ideas! Navillus

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Re: 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.

Posted on Sep 21, 2007

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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 BIOS may be outdated/corrupt, flash the BIOS to the latest firmware if and when you were able to boot it up using the fdd (pls be informed of the inherent possible failure when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.

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

3 Answers

I need to change the motherboard battery on Dell 8100 laptop

sometimes there will be a compartment that can access the cmos battery sometimes not. This guide will show you in pic # 4 what the cmos battery looks like. If you look around the sit for a while you may find your specific laptop. I just don't have the time to look now.
Hope this helps.

Oct 23, 2010 | Dell (S423) for Dimension 8100 (3F546)...

1 Answer


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)...

1 Answer

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

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

No power

type DEL key at startup go in the Bios settings look if poweron is disabled and all related (dont change any if not known to u) otherwise tell me more about your inspiron : is it a new install os(any?)which kind?

Oct 21, 2008 | Dell (E210882) Motherboard

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

Loud fan sound

You have a "No POST" situation. Check the power button, more than likely it is not a solid green.

Your computer is probably old enough to have lifetime troubleshooting support from Dell, if you are the registered owner. They won't replace any parts (but they should help you figure out exactly what _is_ wrong).

I will say that unless you are prepared to do the work yourself, repairing the system will cost nearly as much as buying a new (and much faster) computer. With the economy the way it is, there are some great deals to be had. You'll only need a box, so check out outlets like

Sep 26, 2008 | Dell (S423) for Dimension 8100 (3F546)...

1 Answer

Dell Dimension 4100 Mobo upgrade to a P4 based system

Well the two would not be compatible cause one is a P3 and the next is a P4 two completely different socket types so it wouldn't work but what u can do is buy a new motherboard if u want to upgrade to a P4...thats the only thing that is recommended from such a devices cause an upgrade wouldn't be possible to do .

Nov 22, 2007 | Dell (2336V) Motherboard

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