i know what you mean and i see the problem when i look at the teardown of the 27" imac
the audio jack isn't part of the logicboard - it's a plastic bracket that will become loose by only thinking of it ;-)
[image|60624|size=thumbnail]
you can see the L shaped part in the middle of the picture
the bad part is, there is no guide for that part - but you can use any other guide to open the imac, getting to the part should not be the biggest problem - since you know where is hast to be ;-)
i know what you mean and i see the problem when i look at the teardown of the 27" imac
the audio jack isn't part of the logicboard - it's a plastic bracket that will become loose by only thinking of it ;-)
[image|60624|size=thumbnail]
you can see the L shaped part in the middle of the picture
the bad part is, there is no guide for that part - but you can use any other guide to open the imac, getting to the part should not be the biggest problem - since you know where is hast to be ;-)
good luck