I had a similar problem.
About a month ago, I used sysinstall to install 1.5 on my Centris 610
(full 040).  The Boot kernel wouldn't boot with my Mouse Systems A3
mouse.  I unplugged the A3 mouse and plugged in an Apple branded mouse and
it booted fine.

The Apple mouse I'm using is the rounded one (ADB Mouse II?), not the
older wedge shaped mouse.

(now if I can just get that scsi fix so the machine is useful again)

	- Rog
	rogerf1@mac.com

On Fri, 12 Jan 2001, Eric J. Feldhusen wrote:
> I had the same problem with a IIci. I had been running with 1.4.2, and did
> a completely new install of 1.5 on a new drive I had picked up, and it
> would not boot until I removed the mouse.
> 
> Eric Feldhusen
> > I'm doing a sysinstall of 1.5 on a Q650/Q800, and I can't boot the kernel
> > if I don't unplug the mouse after selection "boot" from the MacOS NetBSD
> > Booter.