Hi friends, today I want to send you a message about my impressions with jumpers. (Take it as a notice for our archive) I had to change my (internal) harddisk. I built in the new one without changing anything, that means, with jumper on "cable select". The result:the cube needs very very long to boot. The "rainbow-circles" is to see quite often. The machine crashes more often then before. Finally my external DVD-R (via Firewire) wasn't accepted by DVD-Player (error code -70012, in german like "no accepted DVD-Player was found"). When I changed jumper to "master" all problems disappeared. Take care. Best wishes Stefan