what does it mean when in the bios, it lists the primary ide master as "not detected"...........is this why I can't get windows xp to boot up after diassembling everything and installing it into another case?.......yet when i go into other areas of the bios, listing components, it shows my WD hard drive.....is there something for me to set on this ?............

yes, the primary hd needs to be detected in order for your OS to boot. make sure the hard drive is connected to the right header and make sure the boot order sequence is correct. you can also try setting the jumper on the hard drive to master.