That is definitely a BIOS password lock. Try these.
Reset the BIOS to defaults by:
Removing battery + AC
Hold FN
Apply AC
Start tapping F11
Stop tapping F11 and release FN when the LEDs cycle on + off
The BIOS is now restored to defaults and the password should have gone.. If not..
Read your manual and learn how to remove RTC (real time clock) battery leave it out for at least 15 mins .. then re-insert battery..(or replace if necessary) You will need to re-enter date and time. In most cases, it is recommended to restart WITHOUT inserting the main battery.. ( Just use the charger) until you have reset the bios details.. including password.. if you want one.. and saved the changes.
Source:
Business support forums - NC6000 Admin Bios Password Recovery