You must make sure your system has no power otherwise you may get shocked.
After disconnecting your system from power wait for about 2 to 5 minutes because some components like capacitors on the motherboard have some stored power in it.
Open the computer case cover and find a Button Cell Battery located on the motherboard. Remove that battery for about 2 to 5 minutes. This will remove all the BIOS settings and Password information from the CMOS (As CMOS is getting power from Battery). Then put the battery back on the board.
Close your system. Connect the power. and start the system.
This time it will not ask for the password !!!
One other way is to position a BIOS configuration jumper on the motherboard to PASSWORD reset position. Not all the motherboard has this jumper setting. Check the motherboard diagram or manual if you have. This option is better to use if you think your system BIOS is configured and that is not the default settings. Like in case you have onboard RAID or SATA/SAS or some other Advanced configuration on the BIOS.
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