the webcam is ok ?
i have already have this problem : the cable which connect to the logic board was a littel broken.
on my imac 17 intel core 2 duo, this cable is for the webcam, the micro + the speakers. (and IR i believe).
it's the cable we see under the Superdrive on this picture :
http://guide-images.ifixit.net/igi/gEoIZ...
on my imac core 2 , this cable is an other place. (you can follow the IR cable to see the connection witj logic board.
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2
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I noticed you never got an answer to this. Are you still having this problem?
crwdns2934271:0crwdnd2934271:0 originalmachead crwdne2934271:0