Can't dual boot Macbook 5,1

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http://forums.fedoraforum.org – Hi, I recently downloaded Fedora 18. De install went fine, but I can't seem to boot into F18. I've tried almost everything. I also have OS X 10.8.4 and I want to dual boot. If I hold the alt/option key, all I get is the Mac partition and no F18. I've tried installing rEFInd. That installed fine, but when I try to boot selecting the linux icon, it does nothing just say "no bootable device". I've let the F18 install automaticaly partition the disk and everything shows fine. Can somebody please help me? I've tried to find answers with google but nobody it seems has the same p (HowTos)