I used to have a Bootcamp partition. Windows 7 was overheating my computer massively, and a friend suggested TinyXP instead. Setup wasn't working correctly so I had to remove the partition. Now I can't make another partition using Bootcamp. It tells me to repair the disk. Disk Utility won't let me do that, and says to boot from the OS X disc and run Disk Utility. When I hold down the C button to boot from the disc I get the windmill as long as I hold the button down. If I let go of the button the computer starts and asks if I want to install Mac OS X. The last time this happened I reinstalled OS X to restore my Bootcamp capabilities. This time I'm trying to avoid a reformat. Why can't I access DVD boot options? This is the original disc that came with my computer.