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<blockquote data-quote="harryb2448" data-source="post: 1739233" data-attributes="member: 42497">Avoid CMM and similar cleaning agents.&nbsp; Use Onyx free and great!&nbsp; And avoid antivirus software.&nbsp; Avoid others such as Mackeeper etc.&nbsp; And be patient downloading operating system using Recovery Mode.&nbsp;&nbsp; It will take at least overnight.<a href="https://discussions.apple.com/thread/5672608?tstart=0" target="_blank">https://discussions.apple.com/thread/5672608?tstart=0</a>A much simpler way is use DiskmakerX to burn a bootable 8GB thumb drive before running the Installer on new operating systems.<a href="http://diskmakerx.com" target="_blank">http://diskmakerx.com</a>Avoid Time Machine.&nbsp; Use an external drive connected by Thunderbolt or FW800.&nbsp; Backup using cloning software such as CarbonCopyCloner or SuperDuper.&nbsp; This backup is then bootable to get you out of trouble.&nbsp; Time Machine is not.</blockquote>

[QUOTE="harryb2448, post: 1739233, member: 42497"] Avoid CMM and similar cleaning agents. Use Onyx free and great! And avoid antivirus software. Avoid others such as Mackeeper etc. And be patient downloading operating system using Recovery Mode. It will take at least overnight. [url]https://discussions.apple.com/thread/5672608?tstart=0[/url] A much simpler way is use DiskmakerX to burn a bootable 8GB thumb drive before running the Installer on new operating systems. [url]http://diskmakerx.com[/url] Avoid Time Machine. Use an external drive connected by Thunderbolt or FW800. Backup using cloning software such as CarbonCopyCloner or SuperDuper. This backup is then bootable to get you out of trouble. Time Machine is not. [/QUOTE]

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