This being the iMac forum, we generally deal with iMac-specific issues here. Sorry we haven't come up with an answer for you (or in the previous two threads you posted).
I'm going to transfer this thread to our Mac OS
forum. Click the link to find your post. Hopefully someone there will have an answer for you.
If not, another place you might try is the user forums over at MacFixIt
. They have a lot of knowledgeable people over there, too.