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 BIOS may be outdated/corrupt, flash the BIOS to the latest firmware if and when you were able to boot it up using the fdd (pls be informed of the inherent possible failure when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