I've done this before on a previous drive I managed to boot OS X and Kali Linux dual booting with rEFInd. However this time on a new drive and fresh OS X Yosemite install I tried rEFInd, didn't work at all.
I tried rEFIt and thats worked and showed up in the boot menu. Yet once I select either two of the Kali install drives it flashes the Linux logo for a brief second then goes straight to a black screen and stays there.
And yes I've looked at the kali docs too
(Reason for this being a duplicate post to another created a few minuets ago is because I evidently posted on a guest account and couldn't reply)