Bios Problem - Sound Card

[evyatar108]

Before i reboot my computer
i was supposed to do in the bios that the cd-rom will boot before the hard drive so i will be able to start the rebooting
But I touch some other things and now when im openning a game its says
i dont have a sound card but i have and those games worked before i rebooted my computer so i need to know how to change the settings in the bios to make my sound card to log the computer again

[edwin]

onboard sound, seperate sound card? What brand/model is the computer/