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Message: <blockquote data-quote="Slydude" data-source="post: 1307274" data-attributes="member: 131855">If you have an external drive with an OS installed you should be able to boor from that. Start with the Mac turned off and try the following:1. Make sure the external disk drive is turn on and give it a moment to spin up to speed. 2. Turn the Mac on and immediately hold down the Option key.3. You should soon see a list of available drives to boot from. Select the external drive and press Enter/Return.If you do not have an external drive with the OS on it do you have access to another Mac? That opens up use of either Target Disk Mode or putting the drive in an enclosure and running Disk Utility on the drive from another Mac.</blockquote>

Verification: How many occurrences of a n-u-m-b-e-r between "d" and "f" in this example...(sdgs6ngklu3gd#f9%)?