Sata HDD won't format? Cable Failure?

I just bought a WD 640gb Green hard drive. My mobo and vista both see the hard drive, I initialized it in disk management, but when I try to format it, it says, "Format failed to complete", or something like that. So I run Western digitals diagnostic tools and all I get is "Cable Test Failed", and it won't run any tests.

I tried setting my mobo to raid and normal, tried two different cables, two different sata ports, jumpers on every setting on the hard drive and I get the same Cable Test Failed.

Is it the drive? or should I try something else. I would just assume it's the drive, but windows and my motherboard can both see the drive, and if I do the long format, it goes all the way to 100% then says "Format failed to complete" Any help would be great, thanks.