Western Digital drives are very odd, sometimes. Be sure the jumpers are set correctly. Realize, there is are "master single drive" and "master with slave present" settings. I once had one to master with slave with no slave. The drive worked, but it was very slow and started blue-screening after windows did it's first reboot.
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Desktop * Athlon X2 4200 | 2G RAM | 160G HD | 7600GT
Laptop1 * C2D T5550 | 3G RAM | 120G HD | Intel x3100
Laptop2 * C2D T5250 | 2G RAM | 160G HD | Intel x3100
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