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If you are not the one who set up the Bios password, your options are to keep guessing or reset the cmos.
To reset the cmos, open your laptop and look for a small, silver, circular battery. Make sure everything is unplugged and remove the battery. Then, simply place the battery back into the computer. This should reset the bios and allow you to access it.
To reset the bios password on your laptop, you will need to remove the
cmos battery on your laptop for some minutes and insert back, the cmos
battery is located on the motherboard of your laptop, once the cmos
battery is removed from the motherboard for some minutes, the bios
password will be reset, and that fix the problem.
The best way for the Sony is to remove the cmos battery for at least 30 minutes. Remove the main laptop battery and leave it out. Make sure the power adapter is not attached. The cmos battery can be reached after removing the keyboard and is attached to the motherboard vis a small cable. If you have a "jumper" that come equipped on hard drives to jump the pins on the back, you can "short" the pin connections on the cmos battery socket, power the laptop up using the ac adapter and letting the computer go through the bootup process. When this happens power the laptop back down, take the jumper off and replace the cmos battery. Power back on with just the ac adapter and boot the computer. If the laptop still askes for a bios password just hit enter and it should allow you to log in. Once in go into the bios and reset the date and time. Once that is done power down and replace the main battery. Reboot the laptop and let Windows load.
I have set the password for administrator when i entered the bios set up. you can change its setting but not the configuration unless you've entered the password. you can't change the password with a new one if you cant enter the old password. Next time dont forget your password because laptops has its security even when stolen you cant open its bios set up if its protected by password. CMOS battery is in the mother board. You need a service technician to open your laptop to reset the bios setup battery.