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!
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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.
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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 BIOS may be outdated/corrupt, flash the BIOS to the latest firmware if and when you were able to boot it up using the fdd (pls be informed of the inherent possible failure when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.
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!
you mostlikely blew a fuse in your power supply, either that or your cord became damaged, to check the cord, plug it into another computer or a monitor, 99% use the same type of cable, if it is your power supply, you need to remove the ps from the desktop, obviously while unplugged and undo the screws for the ps casing, then simply remove the old fuse and replace it
Your power supply has probably failed. I would say to use a power supply tester, but Dell power supplies have a proprietary setup; where a normal PS would light all the lights on the tester, a Dell PS will leave a couple of the lights off. that being said, I'd give 10-1 odds that that is your problem.
That being said, here are a couple of links; the first is for a how-to on replacing your power supply, the second is a link to a refurbished replacement for your PC.
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.
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.
That particular Dell uses a power supply with non-standard wiring. The plug is the same size as an ATX plug, but it's wired differently. If you were to replace motherboard & plug in the standard power supply, it would damage the supply, or the motherboard, or both. Also, the front panel plugs (for power & power LED & hard drive indicator) are proprietary as well. Ideally you should replace it with another Dell Dimension 4600 motherboard. I've found replacements for reasonable prices on some of the auction places on the web. I recently replaced a failed motherboard in my Dimension 8300 with one I got from a popular auction site, I think my cost was about $59 plus shipping.
The other option would be to remove the hard drive, video card (if any), and optical drives, and consider a 'barebones' package from various sites such as geeks or newegg.
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.