Hello to all, i don't know if a post like this is already been add, if so my apologize. I recently got a pmg4 mdd but without memory sticks or hard drive. i don't have all types os memory for pc around the house so i put a windows ram on it and add a hard drive. the question is when i power it on after the chime sound the mac shows a globe and spit out the cd drive and if i press the alt key they show a back and forward key and nothing more. help??