I have an early 2008 iMac that came with Mac OS X 10.5 leopard. I have bought all os's since then, and Today I am using the most recent one, mountain lion. My question is, how can I reinstall the Mac OS X from scratch? Is there a quick way ? Or do I have to:
Find the leopard CDs that came with the iMac
And go through the cd installation.
Then, can I jump from leopard to mountain lion?
If your goal is to just reinstall Mountain Lion, you can restart the computer holding the Command and R keys, then choose the reinstall OS X option from the utilities choices presented to you.
That restarts the computer using the recovery hard drive that was created when you installed Mountain Lion...but note you must have an internet connection when you do this reinstall.