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Old Yosemite drive won't boot unless from current Sierra disk

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Aug 3, 2011
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Motherboard
Gigabyte GA-EP45-UD3P
CPU
quad core
Graphics
nvidia 9800
Mac
Classic Mac
Mobile Phone
I have a working 10.12.6 clover system and I'm trying to boot up from an old drive that has Yosemite 10.10.5 on it. It won't boot on it's own. I have to put in my working Sierra drive, boot into clover and then choose to boot osx from the old drive. That works fine, everything works, Ethernet audio, usb3 etc. I've been trying to run multibeast on the drive so it will boot up on it's own with no success, it starts to load and gets stuck with a white screen with the beachball spinning in the upper left hand corner. Is there a way to move stuff from my sierra drive onto the Yosemite drive that could fix this?

Thanks.
 
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