I'm a pretty big noob at Mac but I burned a 4.7 gb DVD with iatkos on it using transmac. I think I'm having a problem with the customize tab before installation. I left everything original except just checked sound and ahci. It loads up to 70%, says 3 minutes remaining then stops and says installation failed. My specs: 4gb ram, xfx radeon hd 6770, original dell optiplex 390 motherboard, intel core i3 3.3 ghz 2120 processor