I am in the process of ripping my cd collection to a new mac mini. My problem is cds aren't always recognized when inserted. Actually they are recognized and displayed on the desktop and in itunes for maybe one second. They immediately disappear and could not be ejected if I wasn't using the apple keyboard with the eject button. This occurs probably 1 out of 5 cds. itunes is configured to import upon insertion of the cd. Does this seem normal or should I return the mini to the Apple store for check? Thanks.