error message: "NOTE: BIOS IS NOT INSTALLED"

[Marta Resende]

hello, i had freebsd working in my machine(amd athlon xp and asus mobo), and 
today, i change the motherboard and cpu, and when i turn on the computer, it 
says: [NOTE]: THE BIOS IS NOT INSTALLED.

and i reboot and press delete in the boot, to configure the bios, and i 
save&exit, and the same message appears.

So... i did nothing after hardware installation of the mobo and cpu, should 
i have done something to proceed with bios installation??

i post in these forum cause this error was with a MSI k8t board and athlon 
64.

thank you!

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