bootp could not connect to server (no source for :.)

Hi,

I've got two questions about an O² I recovered.  First, I've got 
troubles using the serial console.  I can see the text but it doesn't 
respond to inputs.  I need to press '5' to access the command monitor 
and nothing happens.  Maybe that's related to my terminal though, I'll 
have to run another tests.

Also in graphics mode, with a ps/2 keyboard plugged in, when I try to 
bootp (there's a netbsd install server on the network, with dhcpd.conf: 
allow bootp; and filename "netbsd"; in it and tftp serving 
/tftpboot/netbsd which is unzipped 
NetBSD-5.0.2/sgimips/binary/kernel/netbsd-INSTALL32_IP3x.gz), I get this 
error,
	No server for :.
	[sgi troubleshooting messages...]
	[...] bootp [...] could not connect to server

Any help, feedback or experience on those two issues would be appreciated.

Many thanks,
Pierre-Philipp