When you computer starts up, hit the button to go into the BIOS (F2 , F10, DEL, one of those, it varies) and see if there is a setting for turning your PC Speaker off. I've noticed some of the newer ones arent having that feature in the BIOS anymore though, so it might not be there. Also, dont mess with the other settings while you are in there, some of those settings can be pretty touchy.