On Tue, Jun 24, 2003 at 12:14:35AM +0200, Laurent FAILLIE wrote:
> No output, nothing : the system is fully frosen and
> the system stat as it was at frosen time. As I said,

It you can reproduce this, maybe try to enter the in-kernel debugger:
ctrl-alt-esc

> [...]
> > Is this the exact message ? Did you install the boot
> > selector ?
> 
> Hard disk boot sector invalid
> H to retry with hard disk, another key to boot from
> floppy.

This is a message from the BIOS. Did you disable virus detection in the BIOS ?
Did install by creating a MBR partition, or by choosing the "dangerously
dedicated" whole disk installation ?

> 
> It's very strange for me as I have already swap some
> OS disks (M$-windows) b/w these 2 machines w/o
> trouble.

Try to boot from floppy, and at the boot prompt, type
boot hd0a:netbsd
You can also try to boot from a dos floppy, and type fdisk /mbr
This will reinstall a boot sector from M$, which the BIOS may like better
(this of course if you installed NetBSD inside a MBR-style partition).

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 24 ans d'experience feront toujours la difference
--