There are a few methods for doing this:
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The Bios is written in the motherboard
bios
When the computer is first turned on, (or booted), the BIOS program is in control. After performing a few system checks, the BIOS program turns the computer over to an operating system like Windows XP.
Once your computer boots into BIOS, you need to search around and turn off the option that is telling it to boot to BIOS automatically. Frances
If you are talking about computer fans, then BIOS should have it. To get to BIOS, you must restart your computer, then before windows starts up (during POST) press 'Del' repeatedly.