So i got the new iMac 3.06, hd 4850... and today i get a notice that there is an update.... so i go to download it, and it tells me that i cant... cause my partition needs to be GUID or something.... what i dont understand is why when i bought my imac didnt it already come this way??? so now after everything that i have done on it for the last 3 weeks i have to erase everything and stat all over again cause my hard drive wasnt guid partition??? how can this be? how is anyone who is a new mac owner supposed to know this?.... how can i get this update with out starting all over again??... i dont have an external hard driver to copy all my stuff over to, so is there any other way to do this with out erasing everything and doing it all over again from scratch?? this really ticks me off. macs supposed to be user friendly!!!