@elnino-kun: yes, I remember that horrible story with your DUO CD-Rom. that one sucked dicks in hell. How did you finally solve it?
Well, the first time the problem disappeared after I had system in the trunk of my car driving around.
The second time I didn't find a solution. I think there's something wrong with the laser, it doesn't recognise the CD-Rom at all. The gears however don't seem to be broken but I'm not too sure either. I resolved the problem by buying an interface unit with a CD-Rom drive and a core grafx. The single system CD-Rom is said to be much more stable than the one integrated in the Duo.
However, there seem to be other people encountering this problem and thumpin_termis mentioned a thread with a fix, so I'm off searching it. Maybe I will finally be able to fix my Duo which would be great because the loading time is much more annoying with the interface unit.