s.nico wrote:
Will my existing iphoto library automatically transfer to a newly purchased mac without doing a manual transfer, i.e. is it stored in the cloud somewhere? I'm asking due to a hard drive failure on my existing computer.
Only the photos you kept in My Photo Stream or Shared albums will be in iCloud and download to iPhoto on a different Mac, if you are using the same Apple ID.
if you don't have a backup of your hard drive, you may try a data recovery service for the failed drive, but that will be expensive.