Linux Q’s Is anyone having trouble making ISO Image CD’s bootable?

I’ve had this trouble before, but somehow worked through it. Downloaded Mandrake 10.0 from mirror sites. I’m following the instructs to a “T” from the mirror sites, even printed them out. It goes through the burn proc. without a hitch in both EasyCD & Nero. The CDs just won’t boot. I can see the files using MD 9.2.I’m using create from an CDImage, selecting the ISO image file. Does anyone know if I need to change settings diff. than defaults in either burner. Please Help Anyone!