I have the original style iMac (Graphite Firewire version) and whenever I go to boot it up, it gives me this message. What can I do to fix this? My younger brother managed to screw this mac up and I can't even boot it up anymore.
I had the same exact problem, and have done the archive and install. Would anyone know how I can retrieve files, such as photos from iphoto? When I try to open most files in the previous system folder I get an error saying "could not be opened because you do not have sufficient access privileges." Please someone help!
Find the Previous System Folder, Get Info from the Finder (Command-i), change the owner of the folder to your own account in the Ownership & Permissions section, and then click the "Apply to enclosed items" button. You might have to enter your administrator password to do this, and it could take a while to go through it all. Normally it would be a fantastically bad idea to do this to a live system installation, but since this is an archive of all the old stuff that you're just going to harvest important files out of, it'll be fine. If any other files give you trouble after that, check the permissions on the file in that same part of the Get Info window.