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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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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Posted on Jan 02, 2017

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 BIOS may be outdated/corrupt, flash the BIOS to the latest firmware if and when you were able to boot it up using the fdd (pls be informed of the inherent possible failure when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

1 Answer

DELL 8100 HASENT BEEN USED IN A COUPLE OF YEARS PLUGGED IT IN AND ALL I GET IS A FLASHING YELLOW LIGHT


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

Hi! My dell-dimension 8100 with 40GB was working ok till i up grade with 400GB. After the up grade,my desktop chould'n notice the new hard drive and chould'n instaul window xp. Please what should i do?


When you boot your computer, spam the F2 key to enter the BIOS setup. Select the Drives/Drive Configuration menu, make sure PATA-0 and PATA-1 are enabled. (or whatever is listed for your physical drive ports, the Dimension 8100 doesn't use SATA so those shouldn't be listed). Save settings and restart. XP should now be able to detect the new hard drive.

Sep 29, 2010 | Dell Dimension 8100 PC Desktop

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)...

1 Answer

Dell dem 8100 wont start


The things to check are - is it connected to power? Is the power strip on? Is the power supply on? Reseat all components you can on the inside of the computer. If it still won't start you'll need someone to look at it in person.

Jun 29, 2009 | Dell Dimension 8100 PC Desktop

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No power on .. wire detach from power button in the front panel ... where do the wire go so i could re attach them .. thanx ?


the connectors are labeled.power switch is labeled PS.reset, RS.you can reattach them by following the labels.

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Dell 5100 Dimension - No Power


there are fuses inside psu`s some are solderd and some pop out it i would suggest that u throw the psu away and buy new chances are that it will only cause continues and may even result in 
complete mobo failure problems heres a link to a cheap psu   http://www.microdirect.co.uk/(3649)400W-P4AMD-quiet-PSU-with-PFC-20-pin-24-pin.aspx or a more upmarket more powerfull http://www.microdirect.co.uk/(11879)ThermalTake-TR2-500W-Black-Silent-ATX-12V.aspx the choice is yours.

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