No Bootable Device Found

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http://forums.opensuse.org – Hi, I'm trying to install openSUSE on my Mac BooK Pro. I installed the software on my laptop but cannot boot into it. No matter I choose to boot from "Windows", or "openSUSE", it always shows that "No bootable device". I have to use the dvd disc to boot in to either windows or linux. So what went wrong? Thanks. (Distributions)