I have a 2.4 Intel MacBook that I purchased in April. I want to upgrade the memory to 4gb and swap out the hard drive for a bigger one. I've searched this forum and found conflicting replies. One said that replacing either RAM or my HD will void my warranty, another said that HD is user-replaceable and RAM is not, while another said both are fine. Any idea on what is accurate? How much would it cost to just take it to the Apple Store and have a genius replace the HD and RAM? I can do it myself, but I don't wish to void my warranty.