Hello!
There are already several posts here on Syschat that explain how to reset your biog password for a variety of different models.
Use the search bar near the top of the page.
If none of these help solve your problem, post back here with as much detail as possible and we'll try and help.
Below is an example of a thread for resetting a password.
If you aren't confident with any of the methods used then hold on and ask here first.
regards
Martin
http://www.syschat.com/bios-password-recovery-7119.html