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You will need to change the battery just when the computer says something like this "System CMOS checksum bad - Default configuration used" or also could say something like "CMOS battery low", etc. That's the time to change the battery.
I would suggest that you do a factory reset on your mobo. To do it, here are the steps you can follow.
1. make sure that computer is OFF and unplugged from the wall 2. locate the 3-pin jumper on the mobo that is near the cmos battery 3. once located, remove the cmos battery 4. then from the 3-pin jumper, if the jumper is connected to pins 1-2, switch it over to pins 2-3 5. return the cmos battery back 6. plug the computer back then turn it ON 7. you will probably get an option to reset or restore settings back to factory, it that's the case, continue with it 8. after doing so, turn the computer OFF again and unplug it 9 remove cmos battery then return the jumper to it's original position 10. put in the battery back then turn the computer on again 11. go to the bios and set it back to the setting that you have set it before 12. check and see if problem has been resolved
* I would suggest getting a new cmos battery if it's already old
Usually when you remove the battery, there is a jumper that needs to be set as well. They usually place it near the battery. This is the procedure that works the best for me. FIRST - unplug your computer from the wall outlet. SECOND - take out the battery. THIRD - set jumper to clear cmos. Wait about 5 minutes and reverse each procedure.
Just change your CMOS battery with a new one and after that goto the bios settings and update the time and dare. After that just save the settings and then check that the warning message is coming or not.
If its coming then it means you need to change the CMOS jumper settings.
you will need to open the laptop from the bottom the battery is on the boare very simple to replace it could be one of two batterys the second battery is incased in yellow or blue plastic with to wires helping it to sit in the conputer better
if you want too boot your computer when you start computer thne click delete click one or more time and setting screen available. set first boot cdrom option select.. and save satting. and restart. then you are cdrom open and put bootable CD in cdrom and restart computer see bootable your computer..