"Pete Edwards" <stimpy.u.idiot at gmail.com> wrote: The diagnostics aren't really helpful here. At best they let you format a RD5x that is already formatted. I have NEVER seen the uVax field diagnostics (either "customer" or "field service") actually help diagnose a problem more serious than blown line drivers on a RS-232 port (and we knew that already!) Tips: #-1: Any complaints from the power-on self test? #0: Post the details of your machine check. In my experience most of them are from buggy drivers/misconfiguration. Old versions of UCX are pure crap on a network shared with modern Windows machines etc. Are you getting a crash dump? #1: Get rid of everything except the CPU and minimal memory and system disk controller. Boot VMS. Still have the same problem? If so, it's something in that subset of hardware/software. #2: Add hardware. When it starts crashing again, you found the problem. Tim.