My iMac a first generation Aluminum from 2007. About a year ago the hard drive died so I replaced it with a Segate Barracuda 500 GB drive. Yesterday I tried to install Mavericks, but the install failed because it didn't pass the S.M.A.R.T test, indicating the drive is failing. Do I even bother replacing the drive again or just keep backing it up with Time Machine until it dies. I've got a 13 inch Macbook Pro coming next week and was thinking of replacing my parents Windows XP machine with the iMac.