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Sep 22, 2015 5:27 PM in response to Kjones001200by Rysz,Llocate the installation disks that came with the Mac. Start it from the disk (hold down C key at startup). Use Disk Utility to wipe (reformat) the hard drive clean, then install the operating system and any updates.
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Sep 23, 2015 7:13 AM in response to Kjones001200by Allan Jones,Can you provide the exact model/sub-model and the Mac OS version that it is running?