Well, I'd have booted from cd, and ran installboot:
installboot /dev/rwd0a /usr/mdec/bootxx_ffsv1

No change, booting stops with "NetBSD MBR boot". Sorry.

Cincerely,
Sigmund

p.s. I'd have made up an decision for what to have for diner tomorrow; 
Sacrifice an chicken. :-)

David Laight wrote:

>On Sun, Feb 12, 2006 at 05:06:12PM +0100, Sigmund Skjelnes wrote:
>  
>
>>After install of NetBSD 3.0 the cd were removed and the machine 
>>rebooted. After ram check etc. it wrote "NetBSD MBR boot" at the top of 
>>the screen, and the hdd lamp is flashing, but no more is happening.
>>
>>The bootloader starts ok when I'd boot from cd, and I'd stopped it and 
>>entered "boot hd0a:netbsd", it boots ok.
>>    
>>
>
>I suspect that the old mbr code got copied to the start of the netbsd
>partition (instalboot has a habit of doing that - fixed in current).
>Boot from CD, then rerun instalboot.
>
>	David
>
>  
>