I had this thing running osx 10.10.5, but could never get my r9 290 working, so did like 12 formats trying different things. Anyway, tried to reinstall for the 12th (or more time) and after clean format, now getting this IMMEDIATELY after chameleon. Any ideas? board is B85M-D3H, but successfully installed like 10 times, so not sure why this happens every time. reset my bios/uefi, and reconfigured all the settings hoping to fix it, but can't seem to be able to. still occurs. i've reimaged my usb key, issue persists.