|The short answers....|
- stolen laptop ?
- or - are you trying to access someone else's computer you do not have the legitimate right to access ?
- or - did you just buy this computer from someone for a really cheap price ?
You can't reset the password on modern laptops unless you know what it is.
The password info is stored on a soldered in chip on the mboard that is not the bios chip, and removing all power to it will not erase the user data including the passwords from that chip.
Do you have a legitimate reason for not knowing it ?
Did you buy this computer used ?
There are three types of laptop passwords that can be set in it's bios.
- a system access password - you have to type the password every time you use the computer to use the computer at all.
- a hard drive access password - you don't need to type a password to use the computer at all, but you need to type one before the operating system will load.
A legitimate user is extremely unlikely to forget either one of those because you must type it every time you use the computer.
If you bought the computer used and the seller claims they don't know or forgot either of those, they're probably lying and the computer was stolen.
- the third type of password is the bios access password - you must type it in order to enter the mboard's bios Setup.
If it's not used often, it's possible a legitimate owner might forget what it is.
If that's the only password, if your problem is the Boot Order or similar settings are not set correctly and you can't boot from something you want to boot from, most of, if not all, laptops show a line on the screen while booting "Press xxx to change boot device." or similar - if you press the stated key while that line is on the screen, you can select one device in a list to boot from, even if you can't access the bios Setup otherwise.