In response to your message:

>I have a Q650, running NetBSD 1.3.2 with a generic kernel.  The machine is 
>very nice when it's up and running, often for weeks at a time.  When 
>circumstances make it necessary to shutdown & reboot, the following 
>sequence of events occurs, with alarming regularity:

Had a C650 give me the chimes of death once, but reboot into MacOS and 
NetBSD went fine.  It (thankfully) hasn't reproduced itself.

Bob