Make sure that your USB stick with Yosemite on it is plugged into a USB 2 port, not a USB 3 port.
I was having the same issue and this instantly fixed it.
Article: UniBeast: Install OS X Mavericks on Any Supported Intel-based PC
+1 for USB 3.0 not working on the GA-Z77x-UD5H. Not sure about trim support, really don't even know what that does or if it's working.
@ultrazone, did you have any issues getting the internal temperatures to show up? I've got a pretty similar build (GA-Z77X-UD5H, 3770K, GTX 770) but the only temps I'm getting in OS X are my harddrive temps. The CPU temp shows up in the BIOS, but iStat Pro doesn't seem to be collecting any...
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