Can not boot. As a result of a power failure, I'm now unable to boot. I was able to get to the

Question

As a result of a power failure, I'm now unable to boot. I was able to get to the BIOS window and switched the boot from hard drive to CD. I tried to boot with Windows XP Pro CD. Did not work. I then tried to boot from my " Ultimate Boot CD" and was able to boot to the "Drive Diagnosis Test which said that the hard drive failed. I replaced the drive, but still cannot boot. Any suggestions on what to do next?