If you feel comfortable doing so, remove the back panels that cover the wireless card, RAM, hdd, etc. You're looking for a small button-cell battery with two wires connected to the motherboard. If you see one in plain sight, you're in luck. Disconnect it from the board, remove your laptops full size battery, and make sure it isn't plugged into any power source at all. Leave it for 1-3 minutes. Reconnect the button cell battery (This is a CMOS battery and stores BIOS passwords ), plug the other battery or your charger in, restart laptop. Password should be reset, however some BIOS' hold it in flash memory.
If this is the case, look on the bottom of your laptop and attempt to find a serial number on a white label. it may be labeled s/n or something like that. Type this serial number in at (
http://bios-pw.org/) and attempt to generate a master unlock password for your laptop. This works about 50% of the time for me. If it allows you to get into the laptop, the password generated will allow you to change all passwords in BIOS.