Grub not working

[Valerio daelli]

Hello 
I am trying to install grub as a boot loader on my disk.
I installed it from ports.
When I try to install it on the MBR I get the error

 Running "install /boot/grub/stage1 (hd0) /boot/grub/stage2 p /boot/grub/menu.l
st "... failed

Error 29: Disk write error

I tried to install it with 'grub-install '(hd0)'' and with grub ->
root (hd0,a) -> setup (hd0).
I tried deinstalling the port and installing from sources (version 0.97).
I don't think the problem is with menu.lst since I am using it with
linux (identical file)
and it works.
Anyone a guess?
Thanks

Valerio Daelli