The mobo is P5BW-LA the machine was given to me w/out a HDD. I am trying to install a WD Caviar 500GB SATA. When I try to boot the machine up, I hit esc to enter boot menu and it shows the HDD and the cdrom with the cdrom as 1st master.. If I try to boot off the cd ( the HDD software), it says error cd drive not found and cd drivers not installed check cable and power. If I try to boot a windows xp disc, it reads ( loads) all the files up till setup begins then a blue screen with a stop error telling me to run chkdisk and the HDD is not properly configured. I have replaced many HDD and installed many os enough to know that it should be much much easier than this. Here is the link for all the specs if you need them to help me http://img.tomshardware.com/forum/uk/icones/message/icon10.gif. Also the cd drive was unplugged and I'm not sure which sata port to plug it into or if it makes a difference. I really, really appreciate the help in advance. Thanks. Hope I got the right sub category.