I was going to use boot camp the other day to install a windows on my mac also. It wass not installing properly so i made the entire partition available for for the mac os only and deleted the windows partition. But now when I start the mac up the it goes to a black ascreen and says "No bootable device found - please insert bootable disk." I can get to my hard drive if I hold the option key down while it is booting. then it will work but if I let it just boot it does not boot properly.