<erudolph@uxix.com> wrote in message
news:36f257a5-f096-4f98-993f-cc3a7c79dc59@h11g2000prf.googlegroups.com...
> Good morning,
>
> Has anyone run into a problem where you powered off/on a 420R and
> the
> system never produced console messages again nor does it boot to the
> Forth OS? We have a system that did that
> this morning and we wound up transferring the cards and disks to
> another
> system to recover. I looked at the service manual and the only thing
> of
> interest were two batteries in the system, one system board lithium,
> the
> other a lead-acid battery. Has anyone experienced the same symptoms?
>
> Thanks,
>
> E. Rudolph

Best to start with a NULL modem connection to ttya on the 420R and
disconnect the keyboard.
This will force any output to ttya and should show any problems the machine
is having getting through POST.

The only battery I'm aware of is the one built into the NVRAM.

Trinean