I would suggest contacting Asus. But if you have another sata drive try that in place of the dvd drive. Also change around the power plug. Some systems in the electronics world only detect inputs only when they are used, that could be the case in the bios. Also try to set it up so that it loads off the sata 4th device in bios or sometimes the option is giving in the bio screen some thing like F12-Boot option . Try using another os such as a linux distro to see if that detecs the drive. Good luck.