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Sierra build doesn't recognize boot drive anymore

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Dec 30, 2014
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Asus ROG Strix Z270E
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i7 7700K
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Asus Strix GeForce GTX 1080 Ti
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I've had Sierra running for three weeks now and it's been working perfectly. But today I turned on my computer to find it booted into the BIOS rather than Clover and my SSD wasn't on the boot list. I tried switching out the SATA cable and it booted successfully once, but the problem has since resumed. Where do I start troubleshooting?
 
Joined
Aug 26, 2012
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Motherboard
GA-Z97M-D3H
CPU
i7-4790K 4 GHz
Graphics
GeForce GTX 1080 Ti 11 GB
In the BIOS, you can set the boot priority / order. The default order is determined by the SATA plug number on the Mobo. I therefore suggest plugging the system drive to number 0.
 
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