I have an new iMac in the environment, i've given it a static IP on our network and then i've joined it to the domain using an administrator account. The problem i'm having is when I join the iMac to the domain it doesnt create a computer account for the iMac in Active Directory, I've tried dis-joining it and re-joining putting a new OU path for it place the Computer account in and that hasnt worked. I've also logged the call with Apple to investigate further. I had this issue on Mavericks and I still have it on Yosemite. I already 2 iMacs and Mac Book Pro in the environment which started on Mavericks and joined the domain fine with the computer account being created succesfully.