My susperdive is no longer recognized by tiger 10.4 . ie no dvd icon appears on the desktop. Inserting the DVD, which works on other Macs,is ejected after about 20 seconds. I have also removed the Battery and pressed the start button for 5 seconds, as well as check preferences of the DVD, a Matshuta UJ-846. I think an update may have stuffed things up though I have not been too diligent about recoding updates. Sugestions? apart from buyiong a new drive for 70,000 yen and installation of 10,000 yen, or about $800 according to the apple store nearby.