need to find out what version of the motherboard you have so that you can locate the jumper.
go to click here and use this to find your motherboard detail's.
Then you need to find out on the board where the cmos jumper is, take this out for few second's and then replace it and you will have clean bios'. Make sure that if it is an old bios, that you have the settings for your computer, like hard drive etc
That's no good you will have to open the laptop up they are not easy, and if you was going to do that you only need to remove the cmos battery to reset the defaults. You would stand a better chance by trying to get the password