just built new rigg, wont recogonize my hard drive. help!!!

So i just built a new rig today but my bios isnt detecting my hard drive. It's a sata western digital 500gb and a gigabyte ga-p35-ds3l mother board. Theres power going to the hard drive and the sata cable is inserted correctly so why cant my bios detect it?

i have the same mobo, same hdd, and same problem.. the bios cant detect the hard disk but it detects my sata dvd rom... i got the hdd connected to sata chanel0 and the dvdrom to sata channel3... any help would be appreciated. thanks!

Check the BIOS in the 'Standard CMOS Features' menu to make sure that all the 'IDE Channel x' are set to 'Auto' and not to 'None'.