Hello i just brought got my new iMac payed gor 2 gb ram payed for the better graphics card got that to. Then i payed for the 500 gb Hd and got a 465.44gb Hard Drive a hitachi one? was i saposed to get this ? Im new to mac ? pleasse help and is it saposed to have a Pionner dvd-rw Please help me? have i gotten what i payed for?