Tried to do HD install....created bootdisk, said install succesful.

Reboot, and "Operating system not found".
The bootdisk will only get me to runlevel 2, from a floppy lilo.

I can try running lilo from my commandline,(!) but get an error refering to
/dev/mapper/control

anyone got any useful info?
a link to some info bout how boots operate would be good, too.......