have Intel desktop board D945GNT. And recently I reset (removed and replaced) my CMOS battery. Consequence reboot resulted in unrecognized Hard-disk. After going through the BIOS I found out that my SATA ports (all four of them) are not installed.
BIOS Drive Configuration menu looks like this
USE AUTOMATIC MODE <Enabled>
ATA/IDE MODE <Enhanced> S. M. A. R. T. <Enabled> SATA Port 0 <Not Installed> SATA Port 1 <Not Installed> SATA Port 2 <Not Installed> SATA Port 3 <Not Installed>