"No any drives found"

hi,i have a problem and was looking for some advice on how to fix it, the computer starts,givves me "no any drives found" then boots into windows xp like normal,both hdd's show up and they work fine as far as i can see, i reset my bios settings before to fix the problem that the mouse and keyboard was not working,they work now but i'm not sure what to do,i cant tell the bios to use my sata hdd to boot first,it just wont let me,any help or guidance would be great,thanks,Adam.