Won't boot from my cd/dvd drive.

I have tried what BDaqua suggested but still doesn't work. My computer won't boot from my CD drive nothing is happening. My computer opens with a chime then the gray background with apple logo and whats missing is the swirling thing below the logo. I can't boot, so what other solutiions can you guys suggest.

Tough without the Install disc, but some things to try...
Does it boot to Single User Mode, CMD+s keys at bootup, if so try...
/sbin/fsck -fy
Repeat until it shows no errors fixed.
(Space between fsck AND -fy important).
Resolve startup issues and perform disk maintenance with Disk Utility and fsck...
http://docs.info.apple.com/article.html?artnum=106214
We may get more clues with, Mac OS X: How to start up in single-user or verbose mode...
http://support.apple.com/kb/HT1492

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