Chosen Solution

I Restored a time machine backup of a iMac 24" Late 2006 (Which died years ago) and tried booting into the restored backup on a MacBook 3,1 And a MacBook Pro Mid 2009 15" 2.66 Ghz and it keeps starting to boot (Does the apple logo then loading circle) then restarts. I have tried repairing broken files with disk utility and have tried Safe Mode and still have the same issue. -Jonas

Yes that can happen for a few different issues The OS-X version is too old for the systemThe System is looking for a different boot drive First you should review EveryMac looking at each model to see if they support the same level of OS. If not you’ll need to install the correct OS the current system requires or one thats newer than what it came with. Second I would start up the system using Shift (⇧) Safe Mode or Startup Manager Option (⌥) using an external bootable drive with the needed OS-X/Mac-OS to alter the systems Startup setting.