Might help a bit if you told us what the rest of the hardware in your system is...my guess is either the bios just doesnt' properly recognize it, or could be some kind of bios setting, but other than that, is the drive working normaly? Is it your only drive, and windows is installed on it? I believe only the NF4 boards have support for SATA2 so that could be why it's not being recognized properly..