Modify the BIOS on a Dell machine
Download Dell Command | Configure here: http://en.community.dell.com/techcenter/enterprise-client/w/wiki/7532.dell-command-configure.
Install it on one machine and make a copies of “C:Program Files (x86)DellCommand ConfigureX86” and “C:Program Files (x86)DellCommand ConfigureX86_64”. Use the cctk.exe tool contained in the folders to make your changes. You need the entire X86 or X86_64 folder as your source directory in SCCM, as it contains the driver the cctk needs to communicate with the BIOS.
For a full list of commands, see here: http://www.dell.com/support/manuals/us/en/19/dell-cmnd-config-v3.1/DCC_CLI-v4/Command-line-syntax?guid=GUID-61E28CF5-6240-42C2-B395-E5263AEA511D&lang=en-us. Example:
cctk.exe –autoon=everyday –valsetuppwd=<BIOS password>
If you do not have a BIOS password set, you can leave off –valsetuppwd.