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Are you sure you replaced the CMOS battery with a fresh one? Did you install it backwards (the plus side should be UP). I've only seen a bad CMOS battery cause that problem. I would try one you know is new and check the installation.
<p>The CMOS battery is named after the Complementary Metal
Oxide Semiconductor power. The CMOS has the current date and time functions for
desktop and laptop computers. It allows the computer to automatically adjust
the time, even on computers that are disconnected for long time. When a
computer no longer has the date and time and forget it on every boot, the CMOS
battery probably needs replacing. Some computers have messages when the battery
is weak, while others just lose the current date and time after each shutdown.<br />
<p>Time & Date Errors<span> </span><br />
<p><span> </span><br />
<p>1. Turn on the computer. Look in the task bar at the bottom
right. Make sure the date and time is set correctly. Double-click the time and
click the up or down arrow to switch to the correct time. Click on the arrow
next to month to change the month. Click "OK" when finished.<br />
<p>2. Turn off the computer. Wait 3 to 5 minutes and start the
<p>3. Look on the taskbar to see if time was lost and said a
strange date January 1, 2000. Replace the CMOS battery, if this is the case.<br />
<p>CMOS Error Message<br />
<p>1. Look for error messages like "CMOS checksum
error", "CMOS Read Error" or "CMOS battery failure"
when you start your computer. These errors are caused in the machines shut down
for several months or when the CMOS must be replaced.<br />
<p>2. Let the computer on for 24 hours. Restart the computer
and find the error.<br />
<p>3. Change the CMOS as the return error.<br />
The Checksum error basically shows that boot settings which were previously set has been changed or reset. This usually happens when the battery loses its charge and thus fail to retain the CMOS settings. This can also be caused by a power surge or a damaged motherboard. But most of the times it would be the battery problem.
You can try replacing the CMOS battery and enter the values back into CMOS or reset values to default. Then switch off and boot up again.
Hope this works. Good Luck.
i just want to inform you that CMOS battery failure is not a big deal
you just need to replace CMOS battery from the motherboard
CMOS battery is responsible for date and time management in you PC
also it gives a refrence point in time and space when booting
so if you are a serious programmer you may change it immidiately
and if you are a normal user and you are least bothered with system time and date then
you may keep ignoring this message.
CMOS battery in the motherboard much measured .3 volt which is a Lithium coin cell battery.check whether the battery gives the correct measurement (recomend to use branded battery like from sony). if the measurement is correct then reset your BIOS setting by removing all the jumper in the motherboard for about 60 secs.and place it again and start your pc;set yr BIOS to default setting, let me know if it comes handy to you