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Jul 30, 2016 7:01 AM in response to Justincrewsby Niel,Restart with the Command and R keys held down or insert a compatible Mac OS X install DVD and restart while pressing C or Option, use the Disk Utility to erase the internal drive, and install a fresh OS.
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Jul 30, 2016 7:07 AM in response to Justincrewsby macjack,Hi Justin, first make a copy of your present hard drive, unless you have a recent backup. cloning utility like SuperDuper or CarbonCopy Cloner, or a TimeMachine to backup
Then boot up command + option + R. Choose Disk Utility and erase the entire hard drive (uppermost icon). Now, partition your drive, You need to create at least one partition for Mac OS X that should be formatted OS X Extended, GUID partition scheme which is set by default. Be sure you are connected to the internet via Wi-Fi or ethernet.
The original OS that computer shipped with will be installed. After set up, you can upgrade. After it finishes installing, it will reboot and put you SetUp Assistant. Once you set up your accounts, you can log into the AppStore and upgrade OS X to the newest version your Mac meets the system specification for..
Older Macs
First make a copy of your present hard drive, unless you have a recent backup.
You'll need your original install DVDs for the next step.
Boot from the install DVD. Choose the disk you want to erase in Disk Utility and choose the upper icon, representing the entire drive. Press Erase Disk.
Then, from your DVD, you will install the original OS and from there upgrade to 10.6.8.