So I decided to go ahead and buy the refurb white iMac 24". But all over this forum I keep seeing that the 1GB RAM that comes with it is not enough. The price on RAM seems to be pretty affordable (I just saw 2GB -2x1- for $65) so I am thinking of getting some. But I was wondering how this will affect my applecare? I f something goes wrong eventually, will Apple have the right to refuse coverage because of my RAM upgrade?