I recently bought a used current generation base model iMac. The hard drive is only a 250GB and I would like to upgrade it to at least 500. I called AppleCare to ask if it would void the warranty if I opened it up to install it myself (I live 2000 miles from the nearest Apple store). The person I talked to said it would void the warranty if I opened it up. I asked him three times if he was sure and he said he was 100% positive it would void the warranty. I was under the impression that there was an FCC regulation that said a consumer must be able to access the hard drive in a computer without voiding the warranty. I understand that if I break something in the process it's not covered, but I thought I could perform the task and keep my warranty. Does anyone know the truth about this matter? I couldn't find the regulation so I'm waiting to put the hard drive in.