Hello @ll,I created a Yosemite Zone USB stick. When i try to boot, some files will be loaded. After a few seconds, the pc reboots with no error.I also tried the unibeast method, but the copying file process does not get finished in the virtual box because of a kernel panic (i think caused by the usb device?).I also tried another usb stick with both methods without success. Maybe my issue sounds like this: https://www.hackintosh.zone/forums/topic/6174-haswell-early-reboot/ but i've got a sandy bridge cpu, no haswell. My hardware:Asrock h61icafei5 2500kgeforce 560gtxThank you.