i tried the diag cd's version 5.1 and 5.2. neither of them boot.
there is a lot of activity on the cdrom drive when i either hit F5 or set the boot device to the cdrom, but no boot. does that mean that all the 5.x versions of aix do not like my 7248? i can only hardly believe this, because i believe in the company where i work there are such machines with aix 5.

any more suggestions?