its a bit strange.. i decided to use ide instead of scsi..
i added an old ide hd to the ide port... on the ide hd allready some partitons from my old amiga system.
i connected my cdrom to the second port ..
i booted from cd , the os4.1 screen appears and it hang again
i disconnect the hd and i can boot into os4 from cd
.......speechless
so much tests and so much failures..

it cannot be other hardware that i have in my setup.
i can boot os4 flawless from cd when nothing more is connected to the ide or scsi port. when the hd is uninitialized it works also
i also can boot os4 from my 2.5 hd that was installed by my a1200er.
unfortunately i connected my 2.5 hd displaced by one pin
and now its gone..
im going crazy..
Now i will setup a working system on my 1200er and use it in my 4000.
i have a nullmodemcable somewhere and i know how to use it..
will connect my old win98 pc to the serialport to face the truth

GREETS