I had this very same problem with 1.4.2 on a different machine than I am
currently using, and probably for different reasons, but I accidentally
discovered that changing my processor speed setting in the BIOS to the WRONG
speed of 200mhz (instead of 266, like it really is) fixed it.  I haven't a
clue why, and I don't have that machine anymore to test it with.

Nathan Arthur

> This brings me to the next problem: My system won't boot 1.5_ALPHA2.  I
> only tried twice, but exactly the same thing happened both times:
>
> -Everything works fine until the scsibus discovery probe thing.  It finds
>  my CDROM, then finds my harddrive.  At the exact instant that it prints
>  my harddrive's information
>  (sd0 at scsibus0 targ 8 lun 0: <QUANTUM, ATLAS IV 9 WLS, 9312> SCSI3 \
>   0/direct fixed)
>  the harddrive activity LED comes on and stays on, and then nothing else
>  happens.
>