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CMOS setting reset itself after cold boot
This P4/Asus P4P800 DELUXE system works fine for a while. It's my
secondary system so I don't use it often. Lately it has the following message when booting cold: CMOS setting wrong CMOS Date/Time nto set New CPU installed. Please enter setup to configure your system. Press F1 to run setup. Press F2 to load default values and continue. The date would become January 1 2002. I have to set the time. After reboot, it remembers the setting and the message does not show up. If I turn it off for a while, then it always reset itself. What is the cause of this problem? How can I fix it? Thanks for the information. liu |
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CMOS setting reset itself after cold boot
cpliu wrote:
This P4/Asus P4P800 DELUXE system works fine for a while. It's my secondary system so I don't use it often. Lately it has the following message when booting cold: CMOS setting wrong CMOS Date/Time nto set New CPU installed. Please enter setup to configure your system. Press F1 to run setup. Press F2 to load default values and continue. The date would become January 1 2002. I have to set the time. After reboot, it remembers the setting and the message does not show up. If I turn it off for a while, then it always reset itself. What is the cause of this problem? How can I fix it? Thanks for the information. liu Change the CMOS coin cell. It fits into a socket on the motherboard. Note the orientation and put the new one into the socket the same way as the original. http://data.energizer.com/PDFs/cr2032.pdf The CMOS battery is only used, when the computer is switched off or unplugged. Thus, if you put a computer in storage in your closet, the battery will be under a slight load (measured in microamps). If you know a computer will not be used for a long long time, you might consider recording the BIOS settings, and then removing the battery from its socket, so it doesn't drain. Then put the battery back before plugging the computer into the wall again. (Affix battery to chassis as a reminder to put it back.) As long as the +5VSB is running on the motherboard (signified by the green LED on the Asus motherboard glowing), the CMOS battery is not being used. When the battery is not being used, it will last for whatever period that is the shelf life for that type of battery (could be 10 years or less). The last fresh battery I checked, read a bit more than 3.0 volts. If you connect a multimeter to the top of the battery, and connect the ground on your meter to the computer chassis, a reading of less than 2.4V means it is time to change the battery. The Southbridge typically needs 2.0V and there is a Schottky diode in the path that wastes another 0.4V, so that is where the 2.4V end-of-life value comes from. When a Southbridge has a publicly available datasheet, you can actually look up the minimum CMOS voltage for it. Each chipset could be slightly different, and the end of life value could be different as well. The 2.4V number is an approximate value. Paul |
#3
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CMOS setting reset itself after cold boot
Thanks for the information. I will give it a try.
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