I can't help with your tandem install issue, but the CD ROM problem may be fixed by IDEFix; it is very good at handling these issues. Although you can get it off Aminet, you can get a registered copy from the Amiga Forever CD. Do a full install as it has several useful feature, runs under OS 3.1 to 4.1, and after working its magic sits quietly aside (no ugly prompts -- registered that is). I believe that anyone using IDE on an Amiga should install it; there is a bunch of good stuff on the AF CD