It could well be on a static IP. If the last owner had the option enabled, on reboot a new message will be created in "messages and preferences" on the TiVo menu - probably only on DHCP though.
You could try setting your PC IP to the most likely ranges, 10.1.1.x or 10.0.0.x or 192.168.0.x or 192.168.1.x.
You other options are using a TiVo serial cable, or pulling the HDD and using the OzTiVo PC boot CD to change the options.
Are you in Christchurch or Dunedin by any chance?
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