i want to buy more ram for my imac g5. it only has 512 and i was looking to upgrade to maybe 2gb? or one and half. im going to be running programs like light room. and final cut express/ pro. along with adobe suit. im not sure how many slots my imac has.. i think its only 2, is there any way i could have more then just 2gb of ram? im willing to spend a resonable amount of money.nothing more then 250, becasue im also thinking about buying an external harddrive for all my film.