Weird "stop" logo after installing Yosemite.

I installed Yosemite as per http://www.tonymacx86.com/yosemite-desktop-guides/143976-unibeast-install-os-x-yosemite-any-supported-intel-based-pc.html#download_yosemite

I used the latest Unibeast.

I earlier had a Mavericks installation in a drive which I overwrote to install Yosemite.

When I try to boot Yosemite from my USB (I chose my Mac partition in the boot screen) I get a can't find /System/Library/kernels/mach_kernel error.

So I used this as my boot flags: /System/Library/kernels/kernel GraphicsEnabler=Yes PCIRootUID=0

When I hit enter, I get this screen: http://imgur.com/RbexcJ7

After some time I get this screen: http://imgur.com/GxaAggV

What is the issue?

submitted by aremoij
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What is missing? Please comment to help!

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