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Strange Boot Issues on H61N-USB3 / Radeon 6670

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Hi gang, been a while since I've posted here. Did a clean wipe of my Mavericks install to install Yosemite. First boot up goes according to plan and my GFX card appears to be recognized out of the gate.

Used MultiBeast 7.1 and my proper firmware DSDT and used the usual audio kext and changed profile to a Mac Mini (also tried Mac Pro, both same outcome)

When I go to restart and boot off my HDD, it stays at the grey Apple logo but the status bar doesn't go anywhere.

If I boot -x from my HDD, it boots into Yosemite but my GFX card is a mess, with lots of glitches.

I had this system working 100% with Mavericks, so not sure what the issue is here. Any advice is much obliged.

Zeeebs
 
So I've got it up and running with KernelCache=No but this seems to be a bandaide fix...any ideas?

Thanks
 
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