Hello,
1. you can reset the passwords on normal PC mainboards, but it will not work on notebooks!
2. removing only the coin cell battery will not work! You also have to shift a small jumper on the mainboard to clear the CMOS. (read the mainboard manual!)
But first, try to reset the CMOS in this manner:
1. unplug the power! (Laptop: remove all accus too)
2. set CMOS-Jumper (if exists) to his clear-position (read your mainboard manual to find the jumper)
3. remove the coin cell battery
4. ###!!!put the coin cell (or use a 10 euro cent coin) vice versa into the socket!!!###
5. wait 15 seconds
6. insert the coin cell battery in the right way to its normal position
7. set CMOS-Jumper (if exists) to his normal position
8. plug power (Laptop: insert the accus)
9. reboot PC, enter BIOS-Setup and load "Setup Defaults/Optimized settings"
10. save settings + reboot
Bios-flash guidance:
http://www.jumperz.de/english/bios-upda ... uction.htm