This issue is not related to any operating system (you're not even getting that far). Motherboards will have a jumper on them that resets CMOS. Not only will this remove the password, but it will also configure all the settings back to their defaults. Either check the manufacturer's website or visually scan the motherboard for a jumper that is labeled reset. Most times, after the jumper is set to reset, you turn the PC on but nothing happens (this is normal). Put the jumper back to it's original setting and boot up.