OBP Post failing on V490

My V490 has been running solid for months and I was studying the OBP diagnostics. I enabled the following;
auto-boot false
diag-level max
verbosoity max
diag-switch max
reset-all

The diagnostics are erring about 5 minutes in, and it keeps reporting the same error over and over, looking for a network interface. I can't get it to the boot PROM's OK prompt to disable the diagnostics. I'm accessing the computer via the ttya port - so there's no keyboard or graphics card. How do I break into this to shut down the diagnostics? It has an RSC card but the software's not loaded for it.

Thanks Sincerely,
Pappy52

I would plug in a network cable to a dumb hub and then cold cycle the box.

The system will stop at the "ok" prompt since you have "auto-boot false" set.

You might try logging into the RSC card if one is installed.

HTH

from the lom type break