Seagate 100387575 Barracuda 7200.9 SATA PCB

Q1:  We had a lightning storm that took out 2 network switches in our house.  My wife’s 2007 iMac was still working that evening.  The next day, it could not find it’s hard drive.  The Apple store replaced the drive and said it was a mechanical failure.  The drive is not recognized and clicks repeatedly in regular 2 or 3 second intervals.  A Seagate recovery service has commented that the clicking noise is a bad sign.  Still, because of the lightning storm, I have to wonder if replacing the board would work.  The details follow and would very much appreciate any help you might be able to offer.
Model:                     Barracuda 7200.9 250 Gbytes
Firmware:                3.BQK
Date Code:              07447
Apple ID: 250GB TNK2A 655-1316E *7G71806D7X7VA*
Main Controller:   100404226
Motor Combo IC:  SH960B E
ST 9652W
BARCODE:                100387566 W C7312UN5
PCB:                         100387575 REV D

This Seagate 100387575 Barracuda 7200.9 SATA PCB is listed in Seagate Barracuda 7200.9 PCB on HDDZone.com