I am trying to get into the bios on a thunderbird motherboard. It keeps asking me for the password. I never put a password in it for that. I try to type something in where it shows for a password and nothing shows up. It will then put an X where I am trying to type and after 3 tries, it shuts down.I just want to get it to start with A: drive first instead of the hard drive. Any help here for me?????????????????????????????????????????????????????