OEM stands for something like Original Equipment Manufactuer...or something like that, I can't remember off the top of my cranium. Yea, phosho has it down. No nothing. Hard Drive and maybe a driver cd. Mine had just the Hard Drive. But your cables to connect it should come with the mobo
Nope. At least, not for me. There shouldn't be anything wrong with OEMs. They may encounter probs like factory sealed ones come across, such as being a dud.