X not booting with CD in drive


Bring mich zum Licht!
I had this problem that X suddenly did not want to boot.

After trying around with removing the SCSI card and other things (even a full reinstall), I found out that if a CD is in my drive, it just does not want to boot.

It does not matter what CD is in it.
Why the heck has OSX just up and decided not to boot on us? I havent had any HD problems or anything like that.