Type system password and press Enter password || How To Reset Computer BIOS 

This video shows the easy method of clearing the bios password on a dell Optiplex series. May also work on the dimension models as well
Type system password and press Enter password || How To Reset Computer BIOS
Type the system Password and enter System halted must power down Solved and working
The option to boot from the CD-Rom drive was locked by an admin password.
Error type the systrem password and press ENTER
Enter password
What I show in the video will reset the Admin password which will allow you to re-install a new OS on the computer. This should also reset a BIOS password.
There is another way which involves removing the CMOS battery - it's not a guarantee and takes much longer. I can record a video to show this if it would help - just let me know.
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