After apparently getting a virus/trojan and being unable to boot my old C drive, I bought a 1 TB WD Caviar Black HD, formatted a 200 GB partition and installed XP. The motherboard is a P5WD2 Premium with a 3.4 Mhz P4 CPU. After installing the necessary drivers and a few programs, including Comodo Internet Security Complete 2011, and about 80 Windows updates I powered down and reconnected the old C drive to try and get some data from it. The system could not figure out which drive to boot from and the new WD drive was not one of the options. I have tried several times, unplugged all other drives, save the floppy, and still no boot, getting the "Reboot and select proper boot device" msg. The WD drive doesn't show up in the AMI bios either. Any thoughts?