boot problem

I have a corrupt copy of win xp pro on my computer. I have tried to format harddrive to reinstall new. When I go to bootup from my cd, the computer locks up and does notning. I have checked my boot sequence on the bios, it is set to boot up second after floppydisk. I have tried reinstalling the bios that came with the motherboard. I have tried to format drive from going to c-promt, what do you think could me the problem. I have limited knowledge, but have build six or seven computers. not good at troubleshooting yet.