Ken's machines says:
> Processor Dependent Code (PDC)
>    received an unexpected trap #1 at address 0x00012060

Interruption #1 is a High Priority Machine Check, which is signaled in
cases where there is a hardware error which is severe enough that the
processor can barely keep running.  Things like a failed TLB, etc.,
will cause this.

If powering off for a few minutes doesn't clear it, you may be looking
at a hardware problem on the order of a CPU board replacement.

G.