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Sierra + Mountain Lion, Dual Boot on 2 SSD

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Joined
Sep 26, 2012
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41
Motherboard
H77N
CPU
3225
Graphics
MSI GTX 660 Twin Frozr OC
I installed Sierra on another SSD today. See my Personal Details.
It wasn't easy as usual: I had to reinstall kext files with Multibeast multiple times. Little by little ethernet, audio, big resolution got working. I also had a problem with the VRAM of my GPU, solved using InjectNVIDIA=no with Clover Configurator.
Now my problem is:
how do I make dual boot possible?
If I try starting with 2 drives and Sierra as the main one (Clover), then booting the other one (Chimera) is not possible.
It shows the no parking symbol while booting with Mountain Lion gray color and then it turns off.
 
Would I have a similar solution with my motherboard?
 
Would I have a similar solution with my motherboard?

Yes, I believe it should be the same for you. However, are you certain Mountain Lion supports your hardware?
 
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