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Help ! - working system stopped after creating back up

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PT user

Hi

I have had a working Sierra build for over 12 months now - Wanted to create a Back up so I could experiment with upgrading to High Sierra without damaging my working build however thats whats happened. I used CCC to create the back up with the addition of a post flight script for the EFI. All looked fine, Removed the original working SSD - booted and got the following screen. I then removed the back up and reinserted the original but I cant shift from this screen. ( Ive just realised I cant post the jpeg)  "The system has experienced boot failures due to overclocking..." Its asking me to restore BIOS defaults but I'm nervous to do this as its been fine .  Whats also odd is that the CPU is not overclocked as it suggests . I checked BIOS after.  Im desperate as now I cant use the machine.... My MB is a Gigabyte X79-UP4

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