Why, when I startup my Macbook, does it try and boot from a disc even when there is nothing in the disc drive?

This is a frustrating problem, will I need to format and reinstall the OS? The only temporary fix is if I hold the option key and tell it to boot from the hardrive.

I hate to be a pain, but given the considerable oddity of your situation, I think it might be helpful for us to know the exact wording of the message.
Start up from your most recent OS X installer DVD, open Disk Utility from the Utilities menu, select your internal hard drive in the left pane of DU, click the First Aid tab in the right pane, and run the Repair Disk routine. Then quit Disk Utility, quit the Installer, and try again to sart the computer up normally.

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