Well if it starts to boot from the CD-ROM, that should be okay. I'd sugg. reburning the CD's and maybe cotton-swabbing the laser w/ some isopropyl alcohol. Then try swapping out CD-ROMS. If the CD-ROM drive was bad, it would have been giving you more problems earlier in the install process (like the boot), rather than about the same time.
MacBook 2GHz Intel Core 2 Duo w/ 2GB DDR2 RAM & 120GB SATA 5400RPM HDD
Canon Rebel XTI
Google Cr-48 Beta Laptop