cmos clock time keeps reverting on reboot

November 18, 2010 at 22:18:49
Specs: Windows XP, 1 gb
Each time I shutdown my pc and reboot the cmos clock settings revet to factory settings and checksum error shows. Then I have to go to setup to change the date manually. I have replaced the cmos battery twice but does not seem to correct the problem.

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November 19, 2010 at 04:42:26
Take all of the batteries in for testing since you may have been sold old batteries.
Make sure that your CMOS jumper is in its idle setting (or removed completely).
Make sure that nothing is touching the CMOS jumper's contacts (or CMOS reset button).
Make sure you did not get dirt under the battery.
Make sure you did not bend a battery contact.
Go int BIOS and load optimum defaults (or make all appropriate adjustments).

You have to be a little bit crazy to keep you from going insane.
If all else fails, read instructions.

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November 19, 2010 at 09:58:15
In addition to the above suggestions verify the polarity is correct.

Also, don't handle the battery by the top & bottom.

Verify the clear CMOS jumper is set in the run position, not the clear position. Some manuals have been known to be wrong. I have seen more than one manual come with an insert and have seen notices on the motherboard site warning of a printing error.

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November 19, 2010 at 12:15:02
You must SAVE bios settings after you make changes. Both the date and time should be set to current values.

"...verify the polarity is correct...."

The battery polarity must be correct - in most cases, you must see the + on top of the battery when it's correctly installed in it's socket.
If the battery is installed upside down, the bios will behave the same way it does when the battery is dead or not there at all.

In rare cases there may be corrosion in the battery socket, or on the underside of the contact that touches it's top, that results in the battery having a poor connection. That corrosion must be removed - try household vinegar on a Q-tip, and/or you may need to scrape it off.

"Make sure you did not bend a battery contact."

If the top contact is bent away from the battery, a better way to fix that is to remove the battery, bend the contact toward the bottom of the socket, install the battery. (It's more difficult to bend it a short distance when the battery is installed than to bend it a longer distance when it isn't, and the metal tends to move opposite the direction you have moved it - spring back - when you let go. )

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