I know there are two slots for a total of 1gb. Currently I have 2 256mb sticks for 512mb. I want 1gb and I know that one of the slots is inaccessible. Given that I need to replace both, and don't want to do it myself, can I just take this in to an Apple store with my own RAM I purchase somewhere else, and have them install both sticks? How much do they charge? I have a 17" fp iMac that's a little over a year old. Thanks.