SOURCE: CMOS Battery
you want to be looking for the rtc(real time clock) which is a little unit not much bigger than ur thumb nail.next to it youll find the battery(sometimes heat sealed with plastic.)if you remove this battery for about 5 mins then replace it or in ur case maybe renew it this will reset bios to factory(also method for bypass passwords as every thing is reset)
you might also wanna check ur video card.(connections and dust)
SOURCE: SONY VAIO CMOS BATTERY LOCATION
Correction...
The CMOS battery is located under the system board, and is not accessible from under the keyboard.
The keyboard has to be removed in order to change the CMOS batter, (another reason why I don't like Sony laptops.)
Below is the batter I just pulled from a user's VGN-FS660\W 
SOURCE: Win Xp Drivers for sony vaio vgn-fw230j
Go to download the drivers that you require from the Sony WEB site, to their support/download page. Make sure you input your model laptop and select the Windows OS that matches your installed operating system.
Use this link :-
http://esupport.sony.com/perl/select-system.pl?DIRECTOR=DRIVER&SR=nav:service_support:electronics:drivers_software:esup&ref=http%3A//www.sony.com/index.php
SOURCE: DIP SWITCH BIOS RESET POSITIONS SONY VAIO VGN-fs660
Hello,
There are 2 ways you can reset your bios
.
1.
On the motherboard there is
a small watch battery. Remove this battery along with the power cable
from the power supply. Hold down the power button to fully discharge the
system. Wait 2-3 minutes then reinstall the battery and plug in
your system. Your reset is now complete
2. Some motherboards have a 3
pin jumper by the battery. Lets say that the jumper is on pins 2 and 3.
Remove the jumper while the machine is OFF and place onto pins 1 and 2.
Power on your machine for a minute. (Note: Your system will not POST).
Shutdown your machine and put the jumper back to pins 2 and 3. Your
reset is now complete
This is a great troubleshooting
step for those of you having POST issues or no POSTing at all. Like
other troubleshooting steps, this will not always work but usually will
depending on the problem.
Please let me know if you have any further questions or concerns.
Thanks.
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