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he simplest way to remove BIOS password is to simply remove the CMOS battery. A computer will remember its settings and keep the time even when it is turned off and unplugged because these parts are powered by small battery inside the computer called a CMOS battery. If we pull out this battery, the computer will forget alot of its hardware settings, including its BIOS password. This should not be performed on Laptops if you are not experienced working with laptop hardware. If that doesn't work,you'll need a bios/cmos password recovery tool from http://www.biospasswordrecovery.com
If you're tryng to format the HDD on a Dell latitude C400 (or install an OS), this thing will not boot to any USB devices (flash drives, pen drives, external USB cd-rom drives, etc.) - just ain't gonna happen since the BIOS doesn't support such boot devices. The only thing it'll boot to is (1) docking station, and (2) a Media Bay optical drive.