Hi Bob,
to see what is on the disk, you have to
boot the machine with key in normal position.
I know, you machine halts before:
570 code refers to scsi configuration.
The service position is used to install or go in maintenance
mode, or if system is OK, to run dignostic; diagnostic
starts automatically whit the key in serv. pos. if OS is ok.
Even if there is an OS in your system, and you don't know
his history, root password, oslevel, ecc., is difficult
to manage a system without CD media.
Probably you can find disgnitic floppies (5-10): whit
these you can test the hardware, it is no easy for beginners
and does not anything about OS.
For you, is easier try to install a fresh copy of OS,
rather than manage a system whit a strange story.
I suggest to get any version of AIX: 4.1.X or 4.2.X or 4.3.X: trying to install a new installation, is a sure
mode to test HW. Don't buy AIX now: find a CD ( for now
is sufficent CD #1).
If found, put key in service mode, insert CD and boot:
if nothing happens, your HW is not OK even terminal
but whitout it you cannot continue.
When you are at installation point, continue sending
a post to this thread.
good luck.