[rescue] Help me rescue my Sun Ultra 10 (2x)

[Peter Stokes]

Hi

Well the obvious thing is to try a new NVRAM, (use a 48T58) to see if that cures it.

If not then the motherboards were never that reliable and suspect them next. Out of interest what are the motherboard p/n? (370-xxxx)

Peter

Sent from my iPad

> On 9 Dec 2025, at 20:20, HP van Braam via rescue <rescue at sunhelp.org> wrote:
> 
> 
> Hello!
> 
> I have two Sun Ultra 10s with the same fault, and they came to get the same fault in the same way.
> 
> They both did the following:
> 
> * Started to get IDProm errors
> * Used the "normal" instructions for fixing this
> * Some time later after a reboot things started to go wrong
> 
> This sort of worked for a moment, but now when I apply power to either machine the power led stays off (most of the time) in the very rares time when the power led does turn on I can't succesfully boot the machines. Sometimes they end up booting into Solaris but they are not stable.
> 
> For instance even dtlogin will just start and cycle on and off until ultimately the system hangs entirely. At this point pressing stop+a and resetting usually doesn't boot correctly.
> 
> Swapping around ram/CPUs/power supplies between the two systems has no effect. Removing the AFB doesn't really seem to change anything either.
> 
> It seems kind of unlikely that both computers have the same obscure hardware fault in the same component, I hope this is all just the IDProm fucking up.
> 
> I tried both of the IDProm chips in my minipro reader and they seem to not really read that same each time. And writing data to the chips doesn't seem to "stick".
> 
> Help would be very much appreciated! Thank you! 
> 
> - HP
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