GRUB/LILO Installed, But Still need Install DVD to Boot into os

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http://forums.opensuse.org – After installing the openSUSE 11.3(GRUB/LILO) to my Triple Boot iMac, I cannot boot into Win 7 or openSUSE 11.3 with the boot loader rEFIt. I clicked on the selection, and an error message shows "no bootable device". I have to INSEART THE OPENSUSE 11.3 MEDIA, TO MAKE MY IMAC BOOT INTO WIN 7 OR OPENSUSE. not only my Triple boot iMac is like this, my Triple Boot MacBook Pro is also like this. So what went wrong? (Distributions)