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bios keeps on resetting after shotdown

By NQBEST ·
hi guys,
i have one question and hope someone can answer this, we have 2pc (p3 motherboar) that keeps resettings its bios setup everytime it is shutdown, so everyday the bios date is being adjust by the user to make it correct again, at first i though the motherboard battery so i buy but still the problem persist. Hope someone can answer and give feedback!

thanks!

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by HAL 9000 Moderator In reply to bios keeps on resetting a ...

Remove the CMOS Battery and check for broken contacts in the housing. Also the battery should be mounted with the number away from the M'Board so you can read them. It would also help to check the replacement battery for the correct voltage it should be 3V DC if it's less it's gone flat on the shelf.

There are a few other things that can cause this as well the most likely is that a Jumper has either been removed that allows power to the CMOS or it's been replaced in the Clear Position stopping any power to the CMOS. To find out what is happening here you'll need the manual that came with the system/M'Board depending on who actually made the computer. If it a Name Brand you can log onto their Web Site and download a copy of the Manual but if it's a White Box you'll need to know the maker of the M'Board which you can get from the BIOS String on the bottom of the POST page it's a long number and letter string and the BIOS name will be listed somewhere on the screen something like Award, AMI Phoenix or the like.

Once you have the BIOS string and makers name you can look up here to find out the Maker and Model number

http://tinyurl.com/nl39d

Once you have the Makers name & model you can then visit their Web Site and download the manual for the M'Board. When you have the manual you'll need to look for the way to Clear the BIOS this generally consists of changing a jumper from a 12 connection to a 23 connection on a 3 pin header strip. You'll then need to locate this Header Strip and make sure that the jumper is either on or on the correct pins.

If everything is correct and you still have this problem the M'Board is shot and will need replacing. But I think that you'll find either that your replacement battery is flat or the jumper is set wrong.

Col

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by NQBEST In reply to
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by ozi Eagle In reply to bios keeps on resetting a ...

Hi
If you have the tools and knowhow, measure the current drain on the batter, it should be about 2microamps.
I had a board that did similar things to what you describe, the mobo was drawing over 100 times this current. The fix - replace the mobo.

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by NQBEST In reply to bios keeps on resetting a ...

hi hal, what do you mean bios clear? is that the cmos jumper reset? i tried to clear the cmos jumper but still the same.

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by mjd420nova In reply to bios keeps on resetting a ...

The first thing to check would be the bottom side of the motherboard where the connections for the battery are. Check for any corrosion and the solder should be shiny. If the solder looks dull, try reheating it with a small soldering iron, not over 20 watts, and see if that cures the problem. If that's not it, then the clock chip on the MOBO has failed, or the BIOS chip rom itself has failed.

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by NQBEST In reply to bios keeps on resetting a ...

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