Gigabyte GA-8I945P-G bad flash

[tioklou]

Hello to everyone! i flashed this board with bios from GA-945p-S3 v.ffd. the board posts i see the logo screen the cpu and memory test! but after that give me checksum error defaults loaded press f1 to continue or del to enter setup! the problem is that the keyboard is not working either usb or ps2! when i press the power button the three lights of the keyboard flash 3 times! i tried with the control and home button to reflash it but no light from diskete drive! i reset the bios a few times and plug it off the power but the problem remains! do you have any idea or another way to reflash it?
thank you very much!!!