Computer freezes at startup

Hello, My name is Debbie I was wondering could anyone help me.
I am running windows xp professional service pack 3. My computer freezes up shortly after startup.
I turn on my computer the cd drive light comes on,trying to boot from the cd . About 5 seconds after that my computer just hangs there., Nothing. can't even get into windows
Computer dosen't recognize any keyboard commands tried F2 to enter setup still nothing happens, tried F8 to run in safe mode.
even tried to boot using the recovery cd to restore my computer to it's factory default setting but the computer doesn't recognize anything ,took out my cmos battery and replaced it with anoter thinking that might be the problem but still no luck .Any answer would be greatly appreciated.
Thank You Very Much
Debbie