You evidently don't have the boot order set for CD before hard drive. So the computer is bypassing the CD and trying to boot to the hard drive. The hard drive is no longer bootable because your FUBARED the OS.
What part of non bootable CD don't you understand. I don't care if the CD IS bootable elsewhere, is ain't booting in that system. You may have a defective cable or the laser is weak or dirty in the drive. For whatever reason the CD drive is not reading the CD as bootable. It is as simple as that.
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