Need to reset the BIOS, pull the CMOS battery, will reset the password.
That doesnt always work by the way.....I wont explain fully buts its to do with Bios chips....
All the best Brett
With most desktop PC's there is a simple way of resetting CMOS and clearing password. Read the motherboard manual for instructions . (usually disconnect mains power cable and move jumper on motherboard to clear.) (There is a risk of static damage and changing critical cmos settings)
With business class laptops by major manufacturers such as Toshiba, Dell, HP etc the password is stored in a eprom or similar chip
special software only available to main dealers/authorised computer repair shops is required. (model specific)
They should ask for proof of ownership before helping .
If it is a laptop hard drive password, very few companies can clear it without erasing all data on the hard disk. (so expensive)