[ubuntu] ubuntu only starting while a cd is in the tray

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http://ubuntuforums.org – For some reason Ubuntu (12.04) only starts if a CD is in the CD tray. After selecting the OS if no CD is in the tray then the computer stays with a blank purple screen, but when there is the disc is read and ubuntu boots. It seems to work regardless of disc. I do not believe this affects any actual performance of the computer, but I just have to always have a CD in the tray whenever I turn my computer on. I have also reformatted and reinstalled Ubuntu and this still occurs. Any suggestions on how to stop this? (Hardware)