Laptop bios password

Sorry about that. The battery on the main board. That keeps system time as well as the password. It will look like a large watch battery, most likely nic-cad.

I've seen some CMOS batteries take up to 24hrs to reset. Others instant and then some again that erquire 4hrs.You can reset CMOS by shorting the jumpers instead though.
Best bet is to remove it for 24hrs to be on the safe side. I don't think you are trying to reset the CMOS though.

http://tinyurl.com/h0li says;

The BIOS is a part of the operating system isstored in ROM (read only memory ) so you may not be able to erase it by taking the battery out or even by removing it from it's socket if it can only be erased by exposing it to UV light in the case of an EPROM or an appropriate electrical voltage in the case of an EEPROM.

FOR MICRON with AWARD BIOS:
If a bios password has been set on an award bios, and you can't get round itwithout discharging CMOS, try this one. When prompted for the password, hold down the left shift key and type AWARD_SW. Hit enter and release the shift
key, you've not only bypassed the password, you've removed it!

or

BIOS default passwords- backdoors.

http://www.sysopt.com/bios.html

Various keystroke to access the BIOS on bootup.

http://www.bootdisk.com/bootdir.htm#bios