BIOS can't detect my new Sempron 2800

Hi,
My current BIOS can't detect my new Sempron 2800 (2GHz) processor.
I've download the new BIOS (bios_7n400_f11) from Gigabyte web site.
After updating the new BIOS, it still won't detect my Sempron.

Do I have to set the CLK_RATIO & CLK_SW?
If yes, could you please provide me with the correct settings?

Thank you.


Model Name : GA-7N400
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M/B Rev : Rev: 1.0
BIOS Ver : v.6.00 PG
VGA Brand : ATi Radion 9600 Pro 256MB
CPU Brand : AMD Sempron 2800 (2 GHz)
Operation System : Win XP SP : 1
KIngston 512MB DDR 400 CL 3