Can you see it in disk management? If so, does it have a drive letter assigned? If not give it one and it will be available in My Computer, Windows Explorer, etc. I assume that you used GPT since you already have another 3Tb. It does not sound like a cable issue so don't go digging around yet.
And since you are an early Windows 8 adopter, who knows, perhaps you need a bios update even though it shows up in the bios?????