heh, pass is stored in eeprom-you cant erase with battery removing..
you can choose few ways:
1) send lappy to HP for 300bucks
2) open it and look for eeprom 24Cxx type, read it and send me that data, i modify them and send you back with pass disabled.. (for free)
3) press F2 to enter bios (now ask pass) and press F12, now you must see hash id(from this i can calc masterpassword), but calculation cost something..
4) leave it as is..