When your computer starts up, go into the BIOS and see if its attempting to boot to your CD drive, or some other drive other than your hard drive. Make sure its set to the proper boot device then try again. If that doesnt work then let me know and I will see what I can do to help.
You wiped the system, what is there to boot to now? You need to re-install Windows or Linux or whatever you were using on the computer. Your question is like someone turning off the lights and then wondering why it's dark in the room. You wiped the computer = no more operating system to boot to.