cannot boot

[Lei Ding <mlist001@sina.com>]

I downloaded a single gzip file gnu-2000925.tar.gz,and extract to /dev/hda4,then downloaded grub,compile,and install,then run grub,and use
root (hd0,3)
kernel /boot/gnumach.gz root=hd0s4
boot
then the grub returns to bash,why?

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