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Blank Screen When Trying To Boot From USB HDD

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Mobo: GA-Z68MA-D2H-B3
CPU: i5-2500k
GPU: Radeon HD 6850

After pressing F12 and choosing to boot from USB HDD, the screen goes blank and stays there. Nothing else is happening. Edit: After choosing USB HDD, "boot done" or something similar flashes before it goes blank.

I should first point out that when I tried to run Unibeast ML 1.5.2, it didn't recognize the flash drive, saying it wasn't an OS X system or something like that even though I formatted it correctly. So instead I downloaded the Lion 1.5.2 version and maybe that's the cause, in which case my real problem is figuring out why my drive is recognized by one but not the other. It said it was a legacy drive I believe when I did it this way.
 
Thoughts?

Maybe it's the same as mentioned in the ML tip guide. I don't ever get to that screen though, not sure how to type those commands either if this might solve it.
 
No luck still :banghead:
 
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