Was looking at the N900 Teardown paying very close attention to where the mic was located.

It looks to me that the mic is in a housing and has contact pads that attach it to the main board. It appeared to remain in the case when the mainboard was removed without any hard connectors. It took a LOT of willpower for me not to crack open my broken N900 but one thing I didn't try was thumping (within reason) on it to see if the mic might work. (I don't recommend this.) It seems very likely from the above video that the mic could be slight misaligned and cause the issue.

Anyone have any detailed pics of the inside of an N900 yet?

Brian