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Whenever i switch on the system an error is showing that Date & time is not correct. I have to set the time manually in bios to work the system. What is the reason for this error. How can i solve this.

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I recommend replacing the CMOS battery if it's an old motherboard.

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Your question might be related to this: superuser.com/questions/39496/system-clock-runs-behind – alex Sep 11 '09 at 11:33
How can i get the model of CMOS battery for my motherboard. my MB is intel845GLAD. Is it an easy process.I heard that battery may discharge, if didnt handled properly. – cdb Sep 11 '09 at 11:38
alex, you're a legend :) – Randolph West Sep 11 '09 at 11:38
@alex It is related.. – cdb Sep 11 '09 at 11:38
cdb: Use a CR2032 (from page 29 of your motherboard's users manual). I've found that they are pretty easy to find. Look for a display at the store which has a bunch of different battery sizes. – hanleyp Sep 11 '09 at 11:53
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Replace the battery. The battery type for Intel D845GLAD is CR2032 (see http://www.intel.com/support/motherboards/desktop/d845glad/sb/cs-008718.htm#20.0)

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+1 for providing the additional information on the battery itself. – kez Oct 6 '09 at 19:41
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