Machine doesn't boot with CD

Hi guys I hope you can help!
I have an intel imac, and when it has a cd in it and does a cold boot, it eventually comes up with a question mark in a folder. I'm not blaming the computer but I have previously tried bootcamp as well as the xponmac way. I suspect it is something to do with this and it is trying to boot from a CD on startup. I have already reformatted the drive. it also boots fine everytime without a cd in. can anyone help me?
Thanks in advance.

I tried that, and all seemed fine until today. I couldn't get the machine booted. until I put an OS cd in it and booted again and reselected the startup disk. can anyone help any more? I never uninstalled bootcamp, just nuked the HD. I'm sure I still had this problem. I think its something to do with the boot file

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