First, make sure the jumper is correct. Look at the documentation for the HD and verify that the jumper is correct. Take it off and put it back on to make sure the contacts are good.
Verify that the ribbon cable is correctly oriented. The red stripe on the cable corresponds to pin number 1 on the HD and the MB. The HD should be attached to the connector at the end of the cable.
Make sure the power connector is pushed in all the way. Maybe even try a different power connector
After you power up, touch the top of the HD to see if you can detect any vibration or get a sense that the disk is spinning, or whether it just seems dead.
It could be that you have a bad hard drive. Is there any way you can try it on another computer to make sure?
Do you have another HD that you could use to check whether the problem is with the MB?
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I wonder how much deeper the ocean would be without sponges.