Solved BIOS Settings Will Not Save

July 2, 2012 at 15:57:45
Specs: Windows XP PRO, 2.00 gigahertz 768 Megabytes

I recently acquired a desktop PC with the following Specs:

O/S Windows XP Pro
System Model
AOpen KM400-8237

2.00 gigahertz AMD Sempron
128 kilobyte primary memory cache
256 kilobyte secondary memory cache
Not hyper-threaded

768 Megabytes Usable Installed Memory

Main Circuit Board
Bus Clock: 166 megahertz
BIOS: Phoenix/Award Technologies, LTD 6.00 PG 09/07/2004

Maxtor 6Y080L0 Hard drive 80 GB

When I switched it on, I was presented with the two options of press F1 to Load default settings or Delete to enter Setup.

I enter Delete to reset the BIOS settings and reset the date and time and the required boot up settings.
After I unplugged the PC and switched it back on again the settings were lost and as the pc had not been used for a good, long while I suspected that the CMOS battery was dead.

I bought another one after opening the case and removing the old one and checking the serial number, from eBay (I know) only to read after the purchase that someone had written that a battery bought from them was a dead one, so I bought another from a reputable dealer.

The battery slots into a vertical slot on the motherboard and a metal clip was over the top of it, not touching it, looked as if it was only there to save it falling out if the case was bumped, moved etc

After replacing the battery and ensuring that the battery is well bedded in and touching both the sides of its slot, using the good one the BIOS settings still would not remain as set, so I used the suspect iffy one from eBay still no joy.

I have double-checked that everything was connected and bedded down correctly, but still it will not save the BIOS Settings if unplugged from the mains.

Can anyone assist or point me in the right direction on how to fix this problem?

Many Thanks In Advance


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July 2, 2012 at 16:13:35
✔ Best Answer
Did you put the battery in the right way (shiny,smooth surface facing up).

I am a hardware guy not a software guy but i try to help.

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July 2, 2012 at 16:41:09
The battery sits vertically on the motherboard, I replaced it the same way I took out the old one, with the shiny smooth with the CR 2032 number facing inwards towards the components on the motherboard and the rough side facing towards the PC's casing.

In saying that the person who built the PC would not have been too bothered if the Time/Date was correct in the first place.
I maybe try reversing the battery tomorrow and see if it makes any difference.(I'm in the UK and it's late)

Thank you for the very prompt reply.


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July 2, 2012 at 16:51:09
Im from the UK aswell.

I am a hardware guy not a software guy but i try to help.

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Related Solutions

July 2, 2012 at 20:34:23
It's probably not a good idea to flip batteries around just to see what happens. The correct polarity may be indicated on the motherboard.

Check the batteries with a voltmeter to make sure they're good.

You may need to pull the motherboard and check the battery holder's solder joints on the bottom of the board and make sure they're not broken. Check the voltage with the meter on the joints.

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July 2, 2012 at 21:54:54
It does no harm if the battery is installed backwards. Installing a battery that has enough voltage the right way will allow the time and date to be retained after the AC power to the computer has been removed and restored.
The battery measures 3.3 v when new

" AOpen KM400-8237"

KM400-8237 - that's not the actual mboard model - that's the Via main chipset model.

Look for the model number on the surface of the mboard. It's usually printed in obvious larger characters near the center of the mboard or between the slots.
It's probably either vKM400Am-Sn or MK77M-8XN

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July 3, 2012 at 16:16:57
Thanks to everyone for their help and suggestions, if I had known about this place ages ago I would have saved myself a lot of time.

Eventually solved the problem, thanks to the suggestions here, I metered one of the batteries and got me 3 volts so I knew it was good, tried putting that in the way the old one came out, still no joy, so I tried reversing it and it worked fine.

So it looks as though my dear sweet brother in law never had it set up correctly in the first place he said he only played games on it and never noticed the clock/date??

Again thanks to everyone for their help.


P.S How are you supposed to pick out Set as Best Answer out of all the help I've been given?

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July 3, 2012 at 16:21:51
Select the one that helped you the most and give the others score points.

I am a hardware guy not a software guy but i try to help.

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July 3, 2012 at 18:21:20
We're glad to hear that you solved your problem.
Thanks fior the thanks.

Regarding you brother in law possibly having the battery backwards in the socket, you can have all sorts of strange problems in XP when the date and time are out of whack, but if Windows is running continuously long enough and it's connected to the internet the time and date are automatically corrected in the background by comparing them to the settings for an atomic clock on the web.

I looked at the manual for the AOpen (= Acer Open) vKM400Am-Sn mboard (see response 5) - there's no info in it about which way the Cmos battery installs in the vertical socket, at least not in it's text.
I've only dealt with one mboard that had a vertical battery socket, and as I recall the + side of the battery had to face inwards where you could not see the + when it was installed, but a vertical socket can be installed either way, and there was something blocking the view of the other side of it on that mboard.

As DAVEINCAPS said " The correct polarity may be indicated on the motherboard."

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