Might be that the Vertex is an SATA II rahter than an SATA I and is not "falling back" to SATA I. I'm not familiar with that drive but thats my quick and dirty diagniosis.
Have you tried it on another computer? If it works on another PC, install Win7 on to it that way then put the drive back into your TX. It should go through the hardware setup and eventually boot into Windows.
If it doesn't work on another computer, then you may have a bad drive.
David
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